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• 10,000 Year Clock, United States of America
• Underground Project 131, China
• Mina 13 de Maio, Brazil
• Caverna 14 de Julio, Paraguay
• 19-Lachter-Stollen, Germany
• Tunnel de lave 2004, France
• 3N Cave - Namakdan Cave, Iran
• Third Man Tour, Austria
• 816 Military Nuclear Plant, China
• Site Du 9-9bis, France
• Aachquelle, Germany
• Aareschlucht, Switzerland
• Abadía del Sacromonte, Spain
• Abaligeti-barlang, Hungary
• Ecomuseu Minero Abangares, Costa Rica
• Abano Mineral Lake Natural Monument, Georgia
• Museo Minerario di Abbadia San Salvatore, Italy
• Abbey Caves, New Zealand
• Furna do Abel, Portugal
• Feuersteinbergwerk von Abensberg-Arnhofen, Germany
• Abercrombie Caves, Australia
• Aberdeen Maritime Museum, Great Britain
• Abime, Belgium
• Abismo Anhumas, Brazil
• Abismo Oscuro, Costa Rica
• Cueva del Abra, México
• Abraham's Cave, Turkey
• Abrakurrie Cave, Australia
• Absalom's Tomb, Israel
• Abteimuseum Echternach, Luxembourg
• Abukuma-do, Japan
• Abu Simbel, Egypt
• Ace of Diamonds Mine, United States of America
• Acequia del Toril, Spain
• Caves Ackerman, France
• Grotta di Acquasanta, Italy
• Cuevas de Actún Kan, Guatemala
• Cuevas de Acusa Seca, Spain
• Adalaj Stepwell, India
• Adi Kadi Vav, India
• Adjimushkay Quarries, Russia
• Admiral's Cave, Bermuda
• Admiralty House Park, Bermuda
• Adršpašsko-teplické skály, Czech Republic
• Cueva de Adsubia, Spain
• Adventure Copper Mine, United States of America
• Afawa Cave, Papua New Guinea
• Magharet Afqua, Lebanon
• Aggertalhöhle, Germany
• Saint Barbara Cave Church, Cyprus
• Spilia Agia Paraskevi - Aghia Paraskevi Cave, Greece
• Agia Paraskevi, Greece
• Spilea Agia Sophia - St Sophia's Cave (Kythira), Greece
• Spilea Agia Sophia - St Sophia's Cave (Crete), Greece
• Spilia Agio Gala, Greece
• Spilaio to Agiou Antoniou, Greece
• Cave of Agios Dionysios, Greece
• Spilaio Agios Georgios, Greece
• Agios Georgios Mandelas's Cave, Greece
• Iepa Moni Agios Gerasimos, Greece
• Spilia Ag Ioánnis Erimitis - Hermits' Cave of Saint John, Greece
• Spilia Áyios Ioánnis Iráklia, Greece
• Spilia O'Ag Ioannis Kastro - St John's Hermit Cave, Greece
• Spilia Áyios Ioánnis at Marathokefala, Greece
• Agios Ioannis Damialis Cave, Greece
• Spilaio Agios Mamas - Agios Mamas Cave, Greece
• Agios Spyridon, Cyprus
• Ağırnas Yeraltı Şehri, Turkey
• The Glittering Caves of Aglarond, Middle-Earth
• A GoGo Valkenburg, Netherlands
• Agrasen ki Baoli, India
• Cueva del Agua, Spain
• Agua Azul, México
• Minas del Aguacate, Costa Rica
• Manatial Agua Fría, México
• Cueva del Agua in Orbaneja del Castillo, Spain
• Caverna Água Suja, Brazil
• Grutas del Águila, Spain
• Gruta das Agulhas, Portugal
• Les grottes de l'Aguzou, France
• Aihole, India
• Aillwee Cave, Ireland
• Source de l'Ain, France
• Ain Sahlounout, Oman
• Ain Wazein Cave, Lebanon
• Aitiks Koppargruva, Sweden
• Aitzulo, Spain
• AJ Mine Gastineau Mill Tour, United States of America
• Ajanta Caves, India
• Ajdovska Jama, Slovenia
• Ajkai Bányászati Múzeum, Hungary
• Akarsu Köyü Mağarası, Turkey
• Vai Akaruru, Cook Islands
• Akasaki shonyudo, Japan
• Goa Akbar, Indonesia
• Akhayat Sinkhole, Turkey
• Akhshtyrskaya Cave, Russia
• Museum of Mineral Resources, Japan
• Akiyoshi-do, Japan
• Akka-do, Japan
• Akka Mahadevi Guhalu, India
• Akköy Evleri, Turkey
• Aktun Chen, México
• Cenote Aktun Ha, México
• Alabama Mining Museum, United States of America
• Alabaster Caverns State Park, United States of America
• Aladzha Monastery, Bulgaria
• Gruta Alambari de Baixo, Brazil
• Folkklubs Ala Pagrabs, Latvia
• Cuevas Pedro Antonio de Alarcón, Spain
• Alawala Caves, Sri Lanka
• Alayan-Lion Cave System, The Philippines
• Albarracín-Cella Roman Aqueduct, Spain
• Pestera Albastra, Romania
• Gole dell'Alcantara, Italy
• Gruta das Alcobertas, Portugal
• Al-Daher Cave, Jordan
• Magh?rat al-Dam, Syria
• Magharet Al Dawwayat, Syria
• Grotte d'Aldène, France
• Alderley Edge Mines, Great Britain
• Aldrich Coal Mine Museum, United States of America
• Aleksandrovo Thracian Tomb, Bulgaria
• Alepotrypa, Greece
• Alexander's Cave Houses, Greece
• Alexander Caverns, United States of America
• Alexander Nevsky Cathedral Underground Crypt, Bulgaria
• Alexandra Cave, Australia
• Al Fayah Park, United Arab Emirates
• Museo dei Minerali Elbani "Alfeo Ricci", Italy
• Alfina Hotel, Turkey
• Cueva Alfredo Jahn, Venezuela
• Al Hoota Cave, Oman
• Aliança Underground Museum, Portugal
• Ali Baba's Cave, Australia
• Ali Barbour's Cave, Kenya
• Alikadam Cave, Bangladesh
• Ghar-e-Ali Sadr, Iran
• Spilaio Alistratis - Alistrati Cave, Greece
• Aljibe Andalusí, Spain
• Parque Mineiro De Aljustrel, Portugal
• Al Kittan, Oman
• Allander Tropfsteinhöhle, Austria
• Allikukivi Caves, Estonia
• Sinkgruvene i Allmannajuvet, Norway
• Parque Minero de Almadén, Spain
• Cañón de Almadenes, Spain
• Centro de Interpretación Hábitat Troglodita Almagruz, Spain
• Almbachklamm, Germany
• Cueva de Almendras, Perú
• Almond Valley Heritage Centre, Great Britain
• Almyros Spring, Greece
• Almyros Ag. Nikolaou, Greece
• Alofaaga Blowholes, Samoa
• La Grotte de Glace Alpe d’Huez, France
• The Alpha Omega Cave, South Africa
• Jebal Al Qarah, Saudi Arabia
• Altamira, Spain
• Cueva del Altar, Cuba
• Piatra Altarului, Romania
• Salzbergwerk Altaussee, Austria
• Besucherbergwerk Alte Hoffnung Erbstolln, Germany
• Bergbaumuseum Altenberg, Germany
• Altensteiner Höhle, Germany
• Alter Elbtunnel, Germany
• Alte Saline, Germany
• Naturhöhle Altfinstermünz, Austria
• Altinbesik Mağarası, Turkey
• Altinocak Restaurant, Turkey
• Cueva de Altxerri, Spain
• Alufu Dong, China
• Alum Cave, United States of America
• Alutila Cave, Bangladesh
• Aluvihare Rock Temple, Sri Lanka
• Alux Restaurant & Lounge, México
• Grutas de Alvados, Portugal
• Alvensleben-Stollen, Germany
• Nascentes do Alviela, Portugal
• Amano Yasugawara, Japan
• Amarnath Cave, India
• Schaubergwerk Am Aschenberg, Germany
• Amazing Island Cave, The Philippines
• Mapango ya Amboni - Amboni Caves, Tanzania
• Åmdals Verk Gruver, Norway
• Grotta Naturale Amenano, Italy
• Amer Stepwell, India
• Velká Amerika, Czech Republic
• Les Mines d'Améthystes d'Auvergne, France
• Stollnsystem »Am Graben«, Germany
• Ami Chenin, France
• Amir Chakhmaq Complex, Iran
• Amlwch Copper Kingdom, Great Britain
• Tuffière d´Amorey, France
• Amos Rex, Finland
• Ampanito Valakely, Madagascar
• Eisenbahn- und Bergbaumuseum Ampfelwang, Austria
• Am Phu Cave, Vietnam
• Anakami shonyudo, Japan
• Ananui Cave, New Zealand
• Anapala Chasm, Niue
• Anatakitaki, Cook Islands
• Anatola Cave, Niue
• Anatolian Houses, Turkey
• Anavalos Spring, Greece
• Anchor Church, Great Britain
• Lago di Andalo, Italy
• Cuevas de Andá Mirá, Guatemala
• Andersgrotta, Norway
• Buraco das Andorinhas, Brazil
• Andreas-Gegentrum-Stolln, Germany
• Banské múzeum štôlňa Andrej, Slovakia
• Anemone Cave, United States of America
• Spilaio Anemotrypa, Greece
• Bīr al-Anezīya, Israel
• The Angel Microbrewery Cave, Great Britain
• Cenote Angelita, México
• Grotta dell'Angelo, Italy
• Animal Flower Cave, Barbados
• Pozo de las Ánimas, Argentina
• Grotte d'Anjohibe, Madagascar
• Mines de Fer d'Anjou, France
• Anlage Mitte, Poland
• Anna Barlang, Hungary
• Grube Anna-Elisabeth, Germany
• Anniversary Narrows, United States of America
• Church of the Annunciation, Israel
• Ansite, Spain
• Antelope Canyon, United States of America
• Antoniyevi Pechery, Ukraine
• Pavilon Anthropos, Czech Republic
• Casa Grotta Antica Matera, Italy
• Cuevas de la Antigua Fragua, Spain
• Antiparos, Greece
• Antonijev Rov, Slovenia
• Antonio Pereira Imperial Topaz Mine, Brazil
• Cueva de Anzo, Spain
• Aoiwa shonyudo, Japan
• Sima Aonda, Venezuela
• Grenier d'Aoujgal, Morocco
• Ape Cave, United States of America
• Apedale Mine, Great Britain
• Cave of the Apocalypse, Greece
• Appalachian Caverns, United States of America
• Aquarium Grotto, Egypt
• Aquinaldo Cave, The Philippines
• Projekt Arado, Poland
• La Caune de l'Arago, France
• Aranui Cave, New Zealand
• Sentier karstique ASHVS d'Arbecey, France
• Gruta de Arbedales, Spain
• Saline Royale d'Arc-et-Senans, France
• Arch Cave, Canada
• Archbald Pothole, United States of America
• Arches National Park, United States of America
• El Arco del Tiempo del Río La Venta, México
• Arco Naturale, Italy
• Kaivosyhtiö Arctic Ametisti Oy, Finland
• Grottes d'Arcy-sur-Cure, France
• Cueva de Ardales, Spain
• La Cuevona de Ardines, Spain
• Minas de Arditurri, Spain
• Ardlair Cave, Great Britain
• Ardois'alle, Belgium
• Cueva Arenales, Puerto Rico
• La grotta delle Arene Candide, Italy
• Areni-1 Cave, Armenia
• Fonte Aretusa, Italy
• Gorges de l'Areuse, Switzerland
• Mines de l'Argentière, France
• Cluzeaux d'Argentine, France
• Miniere di Argento Vivo, Italy
• Argo Gold Mill and Museum, United States of America
• Argyle Diamond Mine, Australia
• Argyroupoli Springs, Greece
• Arigna Mining Experience, Ireland
• Arizona Mining and Mineral Museum, United States of America
• Arjeri, Armenia
• Arjun Gufa, India
• Arles Cryptoportiques du Forum, France
• Aven Armand, France
• Arndthöhle, Germany
• Arnhem Cave, Namibia
• Historische Kelders Arnhem, Netherlands
• Arnold Ice Cave, United States of America
• Arnsteinhöhle, Germany
• Arochukwu Cave, Nigeria
• Caverna Aroe Jari, Brazil
• Parque Natural da Arrábida, Portugal
• Arroyo Tapiado Mud Caves, United States of America
• La Grotta dell' Arsenale, Italy
• Coves de Artá, Spain
• Museo dell'Arte Mineraria, Italy
• Cave Village Artenara, Spain
• Schaubergwerk Arthurstollen, Austria
• Artlish River Cave, Canada
• Artwinery, Ukraine
• Aruküla Caves, Estonia
• Arwah Cave, India
• Schau- und Lehrstollen Arzberg, Austria
• Arzberghöhle, Austria
• Asbestos Mineral Museum, Canada
• 'Ashabi Alkahf, Jordan
• Ashabi Kahf, Azerbaijan
• Ashab-ı Kehf Mağarası, Turkey
• Ashio Copper Mine, Japan
• Askola Potholes, Finland
• Askyn Ice Cave, Russia
• Brachoskepi Asprochaliko, Greece
• Goa Asri, Indonesia
• Historisches Dachschieferbergwerk Assberg, Germany
• Schachtanlage Asse II, Germany
• Astana Underground Museum, China
• Astley Green Colliery Museum, Great Britain
• L'Astore Masseria, Italy
• Asura Cave, Nepal
• Ataman Hotel, Turkey
• Atapuerca, Spain
• Atea Kananda, Papua New Guinea
• Grutas de Atepolihui, México
• Atlantida, Ukraine
• Atlantikwall, France
• Atlas Coal Mine National Historic Site, Canada
• Atomic Museum, United States of America
• KGB Atominis Bunkeris, Lithuania
• Atomkeller, Germany
• The Treasury of Atreus, Greece
• Attahöhle, Germany
• Pozas Azules de Atzala, México
• La Carrière d'Aubigny, France
• Musée de la Mine d'Aubin, France
• Musée de la Mine d’Auchel, France
• Grotte des Audides, France
• Auerbachs Keller, Germany
• Aufberger Loch, Germany
• Musée des Mines de Fer d'Aumetz, France
• Auracher Löchl, Austria
• Aurangabad Caves, India
• Aurora Erbstolln, Germany
• Muzeul Aurului din Brad, Romania
• Cueva del Cerro Autana, Venezuela
• Aux Vieux Logis, France
• Avaiki, Niue
• Avan Mine, Armenia
• Äventyrsgruvan, Sweden
• Cueva de los Aviones, Spain
• Disco Ayla, Cuba
• Aydıntepe Yeraltı Şehri, Turkey
• Ayia Napa Sea Caves, Cyprus
• Ayias Solomonis Cave Church and Catacombs, Cyprus
• Ayia Thekla Cave Church, Cyprus
• Ayioi Saranta Cave Church, Cyprus
• Ayios Sozomenos Cave Church, Cyprus
• Aynalı Mağara, Turkey
• Aynalıgöl Mağarası, Turkey
• Ayn Athum Waterfall, Oman
• Ayn Jarziz, Oman
• Ayo Rocks, Aruba
• Ayres Natural Bridge, United States of America
• Ayvaini Mağarası, Turkey
• Grotte d'Azé, France
• Grotte du Mas-d'Azil, France
• Azize Thecla Kutsal Alanı, Turkey
• Azokh Cave, Azerbaijan
• Pozo Azul, Spain
• Cenote Azul, México
• Poço Azul, Brazil
• Grotta Azzurra, Italy
• Höllgrotten Baar, Switzerland
• Baatara Cave, Lebanon
• Jama pod Babjim zobom, Slovenia
• Gruta do Bacaetava, Brazil
• Bachelor-Syracuse Mine Tour, United States of America
• Bacho Kiro, Bulgaria
• Badab Soort, Iran
• Badami Cave Temple, India
• Pećina Badanj, Bosnia and Herzegovina
• Kurzentrum Bad Bleiberg, Austria
• Badger Mine and Museum, United States of America
• Baekryong Donggul, South Korea
• Bärenhöhle, Germany
• Bärenschützklamm, Austria
• Bagdad Mine, United States of America
• Bag End, Middle-Earth
• Baggehola, Norway
• Bagh Caves, India
• Miniera della Bagnada, Italy
• Bagni San Filippo, Italy
• Bagshawe Cavern, Great Britain
• Bahay Paniki Cave, The Philippines
• Chùa Bái Đính, Vietnam
• Bailong Dong, China
• Baima Dong, China
• Bái Ma Jiàng Jun Dòng, China
• Baimo Cave, China
• Bainiao Cave, China
• Baishiya Karst Cave, China
• Baiyun Dong Hunan, China
• Baiyun Dong Jiangsu, China
• Bakhardenskaya Cave, Turkmenistan
• Balaclava Mine, Australia
• Naval Museum Complex Balaklava, Russia
• Balangagan Cave, The Philippines
• Miniera di Amianto di Balangero e Corio, Italy
• Gruta de Balankanché, México
• Balás Jenő Bauxitbányászati Múzeum, Hungary
• Balatoc Mines Tour, The Philippines
• Jeskyne Balcarka, Czech Republic
• Cueva Balcones, Puerto Rico
• Balda Canyon, Georgia
• Bald Hill Mine, Australia
• Balek Sulfur Caves, Papua New Guinea
• Teqehja Ballëm Sulltani, Albania
• Ballica Magarasi, Turkey
• The Ballroom, New Zealand
• Grottenburg Balm, Switzerland
• Grottes de la Balme, France
• Baloc-Baloc Cave, The Philippines
• Balsbergsgrottan, Sweden
• Balver Höhle, Germany
• Grotte di Balzi Rossi, Italy
• Bā mǎ dòngtiānfúdì, China
• Bamei Polje, China
• Baňa Cígeľ, Slovakia
• Banbury Tourist Mine, New Zealand
• Bandelier, United States of America
• Bandiagara Escarpment, Mali
• Bản Giốc Waterfall, Vietnam
• Bănița Gorge, Romania
• Banjaran Hotsprings Retreat, Malaysia
• Banská Štiavnica, Slovakia
• Banwell Bone Caves, Great Britain
• Baotu Spring, China
• Grotte de Bara-Bahau, France
• Barabar Caves, India
• Baračeve špilje, Croatia
• Baradla Barlang, Hungary
• Baranca Sunu Grot, Aruba
• Goa Barat, Indonesia
• Barbarastollen, Germany
• Förder- und Aussichtsturm Barbaraturm, Germany
• Barbarossahöhle, Germany
• Jama Baredine, Croatia
• Bari Imam Cave, Pakistan
• Barracuda Lake, The Philippines
• Gruta da Barreira, Brazil
• Barry troglodyte village, France
• Barsuko Ola, Lithuania
• Bartholomäberg, Austria
• Bartholomäusschacht, Germany
• Barton Springs, United States of America
• Barton Creek Cave, Belize
• Basarbovo Cave Monastery, Bulgaria
• Basiliani Hotel, Italy
• Tunnel du Bassin Bleu, France
• Bastnäsfältet, Sweden
• Bat Cave, Cayman Islands
• Bat Cave, Canada
• Bat Cave Mine, United States of America
• Batadomba Lena, Sri Lanka
• Batatota Lena, Sri Lanka
• Bat Bar (Lost Canyon Cave), United States of America
• Bates Cave, Australia
• Bathala Caves, The Philippines
• Bat Cave, Montserrat
• Battery Hill, Australia
• Battistero Neoniano, Italy
• Battle of Britain Control Room, Great Britain
• Batu Caves, Malaysia
• Goa Batu Cermin, Indonesia
• Gua Batu Maloi, Malaysia
• Agop Batu Tulug, Malaysia
• Ddieri di Baulì, Italy
• Baumannshöhle, Germany
• Grotte de la Baumelle, France
• Cascade des Baumes, France
• Bava Pyara Caves, India
• Crypte du Bayaà, France
• Bayin Nyi Cave, Myanmar
• BC Museum of Mining, Canada
• Beaconsfield Mine and Heritage Centre, Australia
• Beamish Museum, Great Britain
• Bear Cave, United States of America
• Grotta dei Beati Paoli, Italy
• Grotte di Beatrice Cenci, Italy
• St. Beatushöhlen, Switzerland
• Grotte de Beaume Obscure, France
• Ipogeo de Beaumont Bellacicco, Italy
• Grotte de Beaussac, France
• Beaver Falls Karst Trail, United States of America
• Bebravska Pećina, Bosnia and Herzegovina
• Tunnel von Bech, Luxembourg
• Beckham Creek Cave Haven, United States of America
• Beckley Exhibition Coal Mine, United States of America
• Grotte du Bédat, France
• Grotte de Bédeilhac, France
• Bedsa Caves, India
• Beer Quarry Caves, Great Britain
• Grottene i Beiarn, Norway
• Beihai Tunnel, China
• Beishiku Si, China
• Beit She'arim National Park, Israel
• Béke-barlang, Hungary
• Bekiris Cave, Greece
• Pola Bełchatów, Poland
• Cueva de Belda, Spain
• Beldibi Magarasi, Turkey
• Belgrade Underground Tour, Serbia
• Pasaje Belgrano, Argentina
• Belianska Jaskyna, Slovakia
• Pećina Beli izvorac, Serbia
• Belilena Cave, Sri Lanka
• Bell Caves, Israel
• Cuevas de Bellamar, Cuba
• Orrido di Bellano, Italy
• Grotte de Bellevue, France
• Bellevue Underground Mine Tour, Canada
• Bellingham Heritage Centre, Great Britain
• Bell Inn Caves, Great Britain
• Bell Island's Mine Museum and Underground Tour, Canada
• Bellony Cave, Haiti
• Bell Witch Cave, United States of America
• Cueva de Belmaco, Spain
• Belogradchik Rocks, Bulgaria
• Belum Caves, India
• Grotte di Belverde, Italy
• Tsingy de Bemaraha, Madagascar
• Ben's Cave, Bahamas
• Algar de Benagil, Portugal
• Grube Bendisberg, Germany
• Tomb of Benei Hezir, Israel
• Grotte des ain Beni Add, Algeria
• Cuevas de Benifallet, Spain
• La Cueva de Ben Loman, Belize
• Benshan Fifth Tunnel, China
• Benshoof Cistern Museum, Israel
• Benten Cave, Japan
• Benxi Water Cave, China
• Gouffre du Béout, France
• Beppu Benten Pond, Japan
• Berberov Buk, Croatia
• Hoher Brunnen Berching, Germany
• Salzbergwerk Berchtesgaden, Germany
• Heilstollen Berchtesgaden, Germany
• Grotta Marina di Bergeggi, Italy
• Bergmagazin Marienberg, Germany
• Mijnmuseum Beringen, Belgium
• Beringer Vineyards, United States of America
• Berkeley Pit, United States of America
• Berliner Unterwelten, Germany
• Cueva de Berna, Dominican Republic
• Caves Bernard-Massard, Luxembourg
• Grottes de Bernifal, France
• Bernsteiner Felsenmuseum, Austria
• Berry Springs, Australia
• Bersham Colliery, Great Britain
• Bertrix Slate Mine, Belgium
• Besucherbergwerk Bertsch, Germany
• Bešeňovské travertíny, Slovakia
• Beşikli Kaya Mezarları, Turkey
• B-Werk Besseringen, Germany
• Beston Cave, Iraq
• Grottes de Bétharram, France
• Bethlehem Cave, United States of America
• Eiskeller der Brauerei Beuing, Germany
• Beulah Mine, United States of America
• Sentier karstique de Beurey-sur-Saulx, France
• Gua Bewah, Malaysia
• Saarländisches Bergbaumuseum Bexbach, Germany
• Parc archéologique de Beynac, France
• Les Grottes de Bèze, France
• Bezeklik Thousand Buddha Caves, China
• Bhaja Caves, India
• Bhalil Cave Dwellings, Morocco
• Bhandara Buddhist Caves, India
• Bhartrihari Caves, India
• Bhimbetka, India
• Bhimkund, India
• Patal Bhuvaneshvar, India
• Bicchu-Kanachi ana, Japan
• Chùa Bích Động, Vietnam
• Vodopad Bigar, Serbia
• Big Basin, United States of America
• Big Bone Cave, United States of America
• Big Brutus, Inc., United States of America
• Big Four Ice Caves, United States of America
• Big Ice Cave, United States of America
• Big Nugget Mine, United States of America
• Big Opal Mine, Australia
• Big Pit, Great Britain
• Big Salt Cave, Iran
• Big Spring, United States of America
• Big Spring, Anguilla
• Big Thunder Gold Mine, United States of America
• Pecina Bijambare - Bijambare Cave, Bosnia and Herzegovina
• Izvor rijeke Bijele, Croatia
• Mina do Bijoca, Brazil
• Bilsteinhöhlen, Germany
• Bilzingsleben, Germany
• Bimmah Sinkhole, Oman
• Binbirdirek Sarnıçı, Turkey
• Besucherbergwerk Grube Bindweide, Germany
• Binghöhle, Germany
• Bingag Cave, The Philippines
• Binġemma, Malta
• Bingham Canyon Mine, United States of America
• Bing Hu Dong, China
• Moleta de Binifaldó, Spain
• Bird's Botanicals, United States of America
• Birkhill Caverns Clay Mine, Great Britain
• Tigris Tunnel, Turkey
• Birresborner Eishöhlen, Germany
• Peštera "Biserna" - Pearl Cave, Bulgaria
• Špilja Biserujka, Croatia
• Ancienne Mine d'Or et d'Antimoine, France
• Izviri v Bistri, Slovenia
• Citadelle de Bitche, France
• Bixby Ice Cave, United States of America
• Biyundong, China
• Bjärs Grottor, Sweden
• Björnstugugrottan, Sweden
• Gruvmuseet Bjuv, Sweden
• Blaafarveværket, Norway
• Blaauwbank Historic Gold Mine, South Africa
• Black Buddha Cave, China
• Black Chasm, United States of America
• Black-Coffey Caverns, United States of America
• Black Country Living Museum, Great Britain
• Blackfellows Hand Cave, Australia
• Black Hills Caverns, United States of America
• Black Hills Mining Museum, United States of America
• Black Hole, Bahamas
• The Legendary Black Water Rafting, New Zealand
• Manastira Blagoveštenje, Serbia
• Blair Athol Coal Mine, Australia
• Blair Street Underground Vaults, Great Britain
• Blanchard Springs Caverns, United States of America
• Blanche Cave, Australia
• Jeskyně Blanických rytířů, Czech Republic
• Grotte de Blanot, France
• Musée de la Mine de Blanzy, France
• Blaue Quelle, Austria
• Blauer See, Germany
• Blautopf, Germany
• Cova Blava, Spain
• Błędne Skały, Poland
• Blegny, Belgium
• Grube Neue Hoffnung Bleialf, Germany
• Bletterbachschlucht, Italy
• Tunnel de lave Bleu, France
• La Mine Bleue, France
• Source Bleue, France
• Source Bleue Montperreux, France
• Heritage Blinman Mine, Australia
• Bloomington Cave, United States of America
• Il-Hnejja, Malta
• Blue Hole, Egypt
• Blue Creek Cave, Belize
• Blue Eye, Cabo Verde
• Blue Grotto Dive Resort, United States of America
• Blue Hills Tin Streamers, Great Britain
• Great Blue Hole, Belize
• Blue Hole Spring, United States of America
• Blue Hole, Jamaica
• Blue Hole Mineral Spring, Jamaica
• Blue Hole, Bermuda
• Blue John Cavern, Great Britain
• Blue Lagoon, Jamaica
• Blue Lake Rhino Cave, United States of America
• Blue Room Cave, Curaçao
• Bluespring Caverns, United States of America
• Blue Spring, United States of America
• Bluff Dweller's Cave and Browning Museum, United States of America
• Blyde River Canyon, South Africa
• Board Camp Crystal Mine, United States of America
• Gruta da Boa Sorte, Brazil
• Toca da Boa Vista, Brazil
• Bobby Dazzler Walk-in Mine, Australia
• Bobijaško oko, Bosnia and Herzegovina
• Muzeum Przemysłu Naftowego i Gazowniczego im. Ignacego Łukasiewicza, Poland
• Covetes dels Moros, Spain
• Boca Tabla Cave, Curaçao
• Carrière de Bocheresse, Switzerland
• Kopalnia Soli w Bochni, Poland
• Les casemates du Bock, Luxembourg
• Bocksteinschmiede, Germany
• Bodagrottorna, Sweden
• Bodås gruva, Sweden
• Bodenloses Loch, Germany
• Silberberg Bodenmais, Germany
• Boggle Hole, Great Britain
• Pesterna Crkva Sveta Bogorodica, North Macedonia
• Bogovinska pećina, Serbia
• Boiling Hole, Belize
• Petit Ouvrage du Bois de Bousse A24, France
• Ecomusée du Bois-du-Luc, Belgium
• Mineralogické a Banícke Múzeum Bojnice, Slovakia
• Bojnická Jeskyne, Slovakia
• Boka, Slovenia
• Bergrum Boliden, Sweden
• Peștera Bolii, Romania
• Bollinger, France
• Bol'shaya Azishskaya Cave, Russia
• Cova de Bolumini, Spain
• Cueva de B'omb'il Pek, Guatemala
• Bom Jesus da Lapa, Brazil
• Bon Accord Mine Complex, Australia
• Bo Nau Cave, Vietnam
• Bondstollen Kopparberg, Sweden
• Bone Cave, Great Britain
• Boninska Peshtera, Bulgaria
• Cueva Bonita, Spain
• Bonnechere Caves, Canada
• Bonne Terre Mine, United States of America
• Les Carrières du Bon Temps, France
• Boone's Cave State Park, United States of America
• Cavernas El Boquerón, Honduras
• Muzej Rudarstva i Metalurgije Bor, Serbia
• Border Cave, South Africa
• Borenore Caves, Australia
• Grotte Di Borgio Verezzi, Italy
• Il Borgo Ritrovato, Italy
• Tham Borichinda, Thailand
• Hessisches Braunkohle Bergbaumuseum Borken, Germany
• Borra Caves, India
• Boryeong Coal Museum, South Korea
• Pętla Boryszyńska, Poland
• Grotte du Bosc, France
• Bosc de Fades Bar, Spain
• Musée de la Mine de Bosmoreau, France
• Vrelo Bosne, Bosnia and Herzegovina
• Grotta di Bossea, Italy
• Botallack Mine, Great Britain
• Bottini, Italy
• Bottomless Lakes, United States of America
• Gruta de Botuverá, Brazil
• Boulder Caves, United States of America
• Boulder Cave, United States of America
• Ghar Boumâaza, Algeria
• Bounce Below, Great Britain
• Mines de Fer de Bourbach-le-Bas, France
• Grotte de Bournillon, France
• Les Caves Bouvet-Ladubay, France
• Les Boves, France
• Box Canyon Cave, New Zealand
• Tham Bo Ya, Thailand
• Boyd Cave, United States of America
• Boyden Cavern, United States of America
• Boyue Cave, China
• Bozkovske Dolomitove jeskyne, Czech Republic
• Bracken Bat Cave, United States of America
• Abime de Bramabiau, France
• Grotte de Brando, France
• Parcours troglodytique de l'Abbaye de Brantôme, France
• Musée de la Mine Brassac les Mines, France
• Laguna Brava, Guatemala
• Amphitheater Breechkaul, Luxembourg
• Breitachklamm, Germany
• Gruta dos Brejões, Brazil
• Brenztopf, Germany
• Brestovská jasky?a, Slovakia
• Dalen-Kjørholt Gruve, Norway
• Château de Brézé, France
• Hornické Muzeum, Czech Republic
• Bridal Cave and Thunder Mountain Park, United States of America
• Brides Cave, Australia
• Bridge of God, Bulgaria
• Brierfield Turlough, Ireland
• Brighton's Victorian Sewer, Great Britain
• Morski Tunel Brijesta, Croatia
• Brillenhöhle, Germany
• Brimble Pit and Cross Swallet Basins, Great Britain
• Aqueduc Souterrain de Briord, France
• Bristol Caverns, United States of America
• Brněnská kostnice, Czech Republic
• Broken Boot Gold Mine, United States of America
• Schaustollen Silberbergwerk Bromriesen, Austria
• Bronson Caverns, United States of America
• Brooks Drift Mine, United States of America
• Brotherhood Winery, United States of America
• Brotschgrotte, France
• Broumovské stěny, Czech Republic
• Musée de la mine de Bruay, France
• Bruce's Cave, Ireland
• Bruce's Cave, Great Britain
• Bruce Peninsula Grotto, Canada
• Bruce's Caves, Canada
• Wiarton's Hermit, Canada
• Bruedertöbeli, Switzerland
• Brünig Indoor Schiess-Sport-Zentrum, Switzerland
• Caverna de las Brujas, Argentina
• Las Cuevas de las Brujas, Spain
• Brûly-de-Pesche 1940, Belgium
• Bruneckerhöhle, Austria
• Campement préhistorique de Bruniquel, France
• Brunner Mine, New Zealand
• Brunnsteinhöhle, Germany
• Brunson Instrument Company, United States of America
• Mines de Bruoux, France
• Maison de la Mine d’Argent de Jacques Cœur Brussieu, France
• Miniera d'Oro di Brusson, Italy
• Musée des Mines de la Brutz, France
• Bryce Canyon, United States of America
• Bunker B-S 8 Hřbitov, Slovakia
• Bua Tong, Thailand
• Buchenlochhöhle, Germany
• Höhlenburg Buchfart, Germany
• Quarzsandbergwerk im Krähstel, Switzerland
• Buco di Viso, Italy
• Budai Váralagút, Hungary
• Bude Tunnel, Great Britain
• Schaubergwerk Büchenberg, Germany
• Grotta di Bue Marino, Italy
• Buenavista Cave, The Philippines
• Buffalo National River, United States of America
• Buffalo Cave, Vietnam
• Buffalo Bayou Park Cistern, United States of America
• Bugasan Cave, The Philippines
• Kalimuseum Buggingen, Germany
• Bu Haban Cave, Oman
• Bukilat Cave, The Philippines
• Bukovica, Bosnia and Herzegovina
• Bulla Regia, Tunisia
• Bullers of Buchan, Great Britain
• Bullock Creek Sinks, New Zealand
• Bull Shoals Caverns, United States of America
• Bultfontein Mine, South Africa
• Izvor Buna, Bosnia and Herzegovina
• Bundesbank-Bunker, Germany
• Atombunker der Bundesregierung, Germany
• Bunk´Art 1, Albania
• Bunk´Art 2, Albania
• Bunker Mooseum, Italy
• Westwallmuseum Bunker 20, Germany
• Bunkermuseum Emden, Germany
• Bunkermuseum Hamburg, Germany
• Bunkermuseum Rennsteig, Germany
• Grotta del Buontalenti, Italy
• Buraco das Araras, Brazil
• Buraco das Araras, Brazil
• Furna do Buraco do Padre, Brazil
• Besucherbergwerk Burgbergstollen, Germany
• Travertine of Burgtonna, Germany
• Minas de Burguillos del Cerro, Spain
• Burke's Luck Potholes, South Africa
• Burkhardklamm, Italy
• Burlington, Great Britain
• Burra Monster Mine, Australia
• Burrows' Cave, United States of America
• Bushmans Kloof, South Africa
• The Caves of the Bussento River, Italy
• Gouffres des Busseraille, Italy
• Grutas de Bustamante, México
• Hang Bụt, Vietnam
• Covolo di Butistone, Italy
• Butterfly Cave, China
• Musée La Mémoire du Sel Buttes, Switzerland
• Cueva de El Buxu, Spain
• Buynovsko Zhdrelo, Bulgaria
• Buz Mağarası, Turkey
• Buzluk Mağarası, Turkey
• Old Bwana Mukubwa Tourism Centre, Zambia
• Byakuren-do, Japan
• Jeskyně Býčí skála, Czech Republic
• Byron Glacier Ice Caves, United States of America
• Bystrianska Jaskyna, Slovakia
• Cuevas las Cabachuelas, Puerto Rico
• Cabaret Cave, Australia
• Cuevas de Cabarete, Dominican Republic
• Miniera di Zolfo Cabernardi, Italy
• Cabinet War Rooms, Great Britain
• Nucleo Caboclos, Brazil
• Gouffre Géant de Cabrespine, France
• Grutas de Cacahuamilpa, México
• Salina Cacica, Romania
• Cacupangan Cave, The Philippines
• Museu Mina Modelo Caetano Sonego, Brazil
• Café in the Crypt, Great Britain
• Grotte del Caglieron, Italy
• Musée-Mine Départemental, France
• Manoir de la Caillère, France
• Grotta della Cala, Italy
• Cala Covas, Spain
• Grotte di Cala Luna, Italy
• Cova Cala Varques, Spain
• Cenote Calavera, México
• Cueva de las Calaveras, Spain
• Calbiga Caves, The Philippines
• Calcata Cave Houses, Italy
• Calcehtok Cave, México
• Miniera di Calceranica, Italy
• Caldecotte Project, Great Britain
• Caledonia Copper Mine, United States of America
• Grottes de Calès, France
• Caleta Negra, Spain
• Calgardup Cave, Australia
• California Caverns, United States of America
• Çalköy Mağarası, Turkey
• Callao Cave, The Philippines
• Circuit de la Vallée Sèche de Calmoutier, France
• Għar Calypso, Malta
• Città sotterranea di Camerano, Italy
• Cameron Cave, United States of America
• Grotta del Cammello, Italy
• Cammoo Cave, Australia
• Camooweal Caves National Park, Australia
• Cuevas de Campanet, Spain
• Covolo di Camposilvano, Italy
• Museo Termas Romanas de Campo Valdés, Spain
• Lagunas de Cañada del Hoyo, Spain
• Cuevas del Canelobre, Spain
• Canard Duchene, France
• Canashito Grot, Aruba
• Candelaria Caves, Guatemala
• Cenotes de Candelaria, Guatemala
• Mina Candelaria, Chile
• Grotta del Cane, Italy
• Cango Caves, South Africa
• Gruta de las Canicas, México
• Çankırı Tuz Mağarası, Turkey
• Cova de Can Marçà, Spain
• Oriu di i Canni, France
• Los Caños del Peral, Spain
• Coves de Can Riera, Spain
• Cantabon Cave, The Philippines
• Museo del Cantero, Spain
• Canyon Creek Ice Cave, Canada
• Buraco do Cão, Brazil
• Capão Mine, Brazil
• Abri Préhistorique du Cap Blanc, France
• Cape Breton Miners' Museum, Canada
• Capelton Mines, Canada
• Musée de la Mine de Cap Garonne, France
• Capigtan Cave, The Philippines
• Capital Prize Gold Mine Tours, United States of America
• Museo del Capitolo di San Lorenzo, Italy
• Museo delle Miniere di Capoliveri, Italy
• Cappadocia Cave Suites, Turkey
• Cappadocia Palace, Turkey
• Cappadocia Cave Resort & Spa, Turkey
• Catacombe dei Cappuccini, Italy
• Chiesa del Cappuccino Vecchio, Italy
• El Búnker del Capricho, Spain
• La Cueva Caprichosa, Spain
• Capricorn Caves, Australia
• Poza de Fuente Caputa, Spain
• Gorges de Carança, France
• Carbonate Mine, United States of America
• Grotte des Carbonnières, France
• Grotta di Carburangeli, Italy
• Muntanya de Sal a Cordona, Spain
• Carey's Cave, Australia
• Antiche Grotte del Caricatore, Italy
• Gruta de Carlos Pacheco, México
• Carlotta Arch, Australia
• Carlsbad Caverns, United States of America
• Carmel National Nature Reserve, Great Britain
• Carnglaze Slate Caverns, Great Britain
• Carolinen Grube, Germany
• Grottes de Carpe Diem, France
• Estación de Carpetana, Spain
• Carran Turlough, Ireland
• Carreau Rodolphe, France
• Musée du Carreau Wendel, France
• Carreg Cennen Castle Caves, Great Britain
• Carrières des Capucins, France
• Bat Cave, United States of America
• Cascade Cavern, United States of America
• Saltpetre Cave, United States of America
• X Cave, United States of America
• Cartwright's Cave, Bahamas
• Cartwright Duho Cave, Bahamas
• Museu Estadual do Carvão, Brazil
• Gruta do Carvão, Portugal
• Algar do Carvão, Portugal
• Carver's Cave, United States of America
• Casa Cava, Italy
• Casa Cisterna Sotterranea, Italy
• La Casa di Lucio, Italy
• Storica Casa Grotta di Vico Solitario, Italy
• Casa Grotta del Casalnuovo, Italy
• Hang Cá Sấu, Vietnam
• Cascade Caverns, United States of America
• Cascade des Tufs, France
• Parque da Cascata, Brazil
• Casibari Rocks, Aruba
• Casino Keller, Austria
• Cueva de Castañar, Spain
• Souterrain médiéval du Castela, France
• Grotta di Castelcivita, Italy
• Grotte di Sant'Anna Castelfidardo, Italy
• Grotta di Castellana, Italy
• Santuario del Pla de Petracos, Spain
• Castello Sicano, Italy
• Grotta di Castello Tesino, Italy
• Castle Cave, Australia
• Castle Dome Mine Museum, United States of America
• Castleplunkett Turlough, Ireland
• Catacombe Roma - The Catacombs of Rome, Italy
• The Catacombs of Paris, France
• Çatak Kanyonu Cam Terası, Turkey
• Cueva Cataratas de Hueque, Venezuela
• Cataviña, México
• Grutas de la Catedral, México
• Besucherbergwerk Grube Catharina Neufang, Germany
• Cathedral Cave, United States of America
• Cathedral Caves, New Zealand
• Cathedral Cave, Great Britain
• Cathedral Cave, Bermuda
• Cathedral Cave, Australia
• Cathedral Gorge, Australia
• The Cathedral, Bahamas
• Cathedral Gorge, United States of America
• Cathedral Caverns, United States of America
• Cathedrale d'Images, France
• Les Cathédrales de la Saulaie, France
• Cat Hole Cave, Great Britain
• Grotta del Caudano, Italy
• Giant's Causeway, Ireland
• Cava 177, Italy
• Museo Cava Acque, Italy
• Parco archeologico di Cava d´Ispica, Italy
• Cavallo d´Ispica, Italy
• Grotta del Cavallone, Italy
• Furnas do Cavalum, Portugal
• Cavan Burren Park, Ireland
• Cavannagh Cave, Anguilla
• Cave-in-Rock State Park, United States of America
• Cavea Arcari, Italy
• Cave and Basin, Canada
• Cave Creek, New Zealand
• Cave Creek Museum, United States of America
• Cave Escape Nottingham, Great Britain
• Cave Garden, Australia
• Cave Hill, Ireland
• Caveman Bar-BQ & Steak House, United States of America
• Cave of the Winds, United States of America
• Cave of the Winds, United States of America
• Caveoso Hotel, Italy
• Cave des Producteurs de Montlouis, France
• Cave River Park, United States of America
• Cavern Club, Great Britain
• Caverna 54, Paraguay
• Cavern Lake Cave, United States of America
• Caves Branch Jungle Lodge, Belize
• Cave Spring, United States of America
• Cave Spring Historic Site & Nature Center, United States of America
• Cave Spring Caverns, United States of America
• Cave Spring, United States of America
• Cave Spring Hollow, United States of America
• Cave Stream, New Zealand
• Cave Vineyard, United States of America
• Museo della Miniera e del Territorio Cavriglia, Italy
• Cayman Crystal Caves, Cayman Islands
• Roc de Cazelle, France
• Bois du Cazier, Belgium
• Cedar Creek Springs, United States of America
• Cefn Coed Colliery Museum, Great Britain
• Cehennemağzi Mağarası, Turkey
• Grotte Célestine, France
• Cennet Adası Mağarası, Turkey
• Cennet ve Cehennem, Turkey
• Cenobio de Valerón, Spain
• Mine d'Argent Romaine de Cénomes, France
• Cenotillo, México
• Centaur's Cave, Antigua & Barbuda
• Gruta do Centenário, Brazil
• Center Mine, United States of America
• Cento Pozzi, Italy
• Centralia Burning Coal Mine, United States of America
• Cerberus Cave, Australia
• Museu de les Mines de Cercs, Spain
• Grotte du Cerdon, France
• Ceremošnja Pecina, Serbia
• Gua Cerita, Malaysia
• Cerknisko Jezero, Slovenia
• Cerme Cave, Indonesia
• Cerovačke špilje, Croatia
• Cerro Azul, Colombia
• Cavernas del Viejo Volcan Parque Cerro Leones, Argentina
• Grafitový důl Český Krumlov, Czech Republic
• Pestera Cetatile Ponorului, Romania
• Izvor rijeke Cetine, Croatia
• Cetinjska Pećina, Montenegro
• Cenote Chac Mool, México
• Chainospilios, Greece
• Grotte de la Chaise, France
• Chal-Nakhjir, Iran
• Hang Cha Loi, Vietnam
• Estación de Chamberí, Spain
• Chambers of the Black Hand, Australia
• Chamera Guffa, Nepal
• Musée Suisse de la Spéléologie, Switzerland
• Musée de la mine de Champagnac, France
• Fort d'artillerie de Champex-Lac, Switzerland
• Le Musée du Champignon, France
• Chañarcillo Mine, Chile
• Chand Baori, India
• Changsheng Dong, China
• Changyu Dongtian - Changyu Stone Cave, China
• The Channel Island Military Museum, Great Britain
• Channel Tunnel, Great Britain
• Chaoyang Dong, China
• El Chapandáz, Spain
• Chapel Cave, United States of America
• Gua Charah, Malaysia
• Cueva Charles Brewer, Venezuela
• Charlottenhöhle, Germany
• The Chasm, New Zealand
• Underground Chattanooga, United States of America
• Chatterley Whitfield Mining Museum, Great Britain
• Grotte des Chauves-souris, Tunisia
• Grotte Chauvet 2 Ardèche, France
• Grotte Chauvet, France
• Che Chem Hah, Belize
• Cheddar Caves & Gorge, Great Britain
• Cheddar Gorge, Great Britain
• Chelmskie Podziemia Kredowe, Poland
• Chelter-Koba, Russia
• Chemin de la Mâture, France
• Cenote Chemuyil, México
• Cheondong Cave, South Korea
• Cheongok Golden Bat Cave, South Korea
• Cheoram Coal Mine History Village, South Korea
• Museum of Speleology and Bulgarian Karst, Bulgaria
• Oriu de Chera, France
• Historic Cherokee Caverns, United States of America
• Cherokee Cave, United States of America
• Chersonesos Cave Chruch, Russia
• Chessiloch, Switzerland
• Tham Chet Khot, Thailand
• Cheung Po Tsai Cave, China
• Tham Chiang Dao, Thailand
• Chicago Museum of Science and Industry, United States of America
• Cueva del Indio de Chichiriviche, Venezuela
• Cueva de Chicho, Dominican Republic
• Minas Chico Rei, Brazil
• La Caverna de Chicoy, Guatemala
• Chi Day Caves, Vietnam
• Grotte du Chien, France
• Hang Chiều, Vietnam
• Chifley Cave, Australia
• Museo Mina Chiflón del Diablo, Chile
• Cenote Chihuo-Hol, México
• Chikura Cavern, Japan
• Chilibrillo Cave, Panama
• Chillagoe Caves, Australia
• Chinhoyi Cave, Zimbabwe
• Chiquibul Cave System, Belize
• Chislehurst Caves, Great Britain
• Grotta di Chitaridd, Italy
• Museo civico "La Città Sotterranea", Italy
• Cholerenschlucht, Switzerland
• Cholerenschlucht, Switzerland
• Chollar Mine, United States of America
• Cholula - Quetzalcoatl Tunnels, México
• Tham Chom Ong, Laos
• Rìo Subterráneo Chontalcoatlán, México
• Tham Chorakhe, Thailand
• Grottes de Choranche, France
• Chrám kamene, Czech Republic
• Chreli Abano, Georgia
• Christian Cave, Japan
• Besucherbergwerk Grube Christiane, Germany
• Christiansborg Slot, Denmark
• Schieferbergwerk Grube Christine, Germany
• Chrustenická Šachta, Czech Republic
• Chua Tien, Vietnam
• Chudnite Mostove, Bulgaria
• Cueva de Chufín, Spain
• ChufutKale, Russia
• Chuiyun Tongtian River, China
• Chumash Painted Cave, United States of America
• La Chumbera, Spain
• Chuquicamata Copper Mine, Chile
• Church Cave, Great Britain
• Paddock - Churchill's Secret Bunker, Great Britain
• Chýnovská jeskyně, Czech Republic
• Fonte Ciane, Italy
• Grotta di Ciccio Felice, Italy
• Jaskinia Ciemna, Poland
• Fuente de los Cien Caños, Spain
• Cierny Vyvieracka, Slovakia
• Hoyo El Cimarrón, Guatemala
• Cincinnati Museum Center, United States of America
• Fort du Cindey, Switzerland
• Circ romà, Spain
• Císařská jeskyně, Czech Republic
• Museo Paseo de la Cisterna, Argentina
• Cisternerne, Denmark
• Cisterne Romane Amelia, Italy
• Cisternone, Italy
• Cisternone Romano, Italy
• Citadelle de Namur, Belgium
• La Cité du Volcan, France
• Tunnel de lave Citron Galets, France
• City Museum, United States of America
• Ciudad Encantada, Spain
• Civil Defense Caves, United States of America
• Grotte de Clamouse, France
• Cueva Clara de Enpalme, Puerto Rico
• Grube Clara, Germany
• Clarksville Cave, United States of America
• Cunicoli di Claudio, Italy
• Clearwater Cave, Malaysia
• Clearwell Caves, Great Britain
• St. Clements Caves, Great Britain
• Cliff Cave, United States of America
• Cliffs Shaft Mine Museum, United States of America
• Clifton Cliff Jail, United States of America
• Cloaca Maxima, Italy
• Grotte du Clos del Pous, France
• Le Clos des Roches, France
• Phosphatières du Cloup d'Aural, France
• C-Mine, Belgium
• C.M.T. Underground Mine Tour, Australia
• Devil's Coach House, Australia
• Coaltown Museum, New Zealand
• Las Cuevas de la Cobanerita, Guatemala
• Barrancas del Cobre, México
• Grotte de la Cocalière, France
• Grotta di Cocceio, Italy
• Entente Mine Cockerill, Luxembourg
• Grutas de Cocona, México
• Cody Caves Provincial Park, Canada
• La Miniera Di Cogne, Italy
• Peștera Coiba Mare, Romania
• Peștera Coiba Mică, Romania
• Schloß Colditz Escape Tunnels, Germany
• Cold Water Spring, United States of America
• Coleman Rock Shop & Crystal Mines, United States of America
• Coles Cave, Barbados
• Cueva de Colín, Cuba
• Les Coves del Collbato, Spain
• Grotta di Collepardo, Italy
• Replica Underground Coal Mine Experience, Australia
• Covetes del Colomer, Spain
• Cova d'es Coloms, Spain
• Cova dels Coloms, Spain
• Gruta Colón, Uruguay
• Colonial Adit Underground Mine Tour, Canada
• Colorado School of Mines Museum, United States of America
• Colorado Bend State Park, United States of America
• Colorado Provençal, France
• Gruta Colorida, Brazil
• Colossal Cave, United States of America
• Colossal Cave, United States of America
• Colosseum, Italy
• Colowyo Mine, United States of America
• Peştera Comarnic, Romania
• Grotte des Combarelles, France
• Combe Grède, Switzerland
• Grotte et Abime de Comblain-au-pont, Belgium
• Comet Gold Mine, Australia
• Compromise Mine, United States of America
• Fuente Concejo, Spain
• Las Conchas, Guatemala
• Conch Bar Caves, Turks and Caicos Islands
• Congoman Cave and Restaurant, Tanzania
• Hang Con Moong, Vietnam
• Zeche Consolidation, Germany
• Cirque de Consolation, France
• Consolidated Gold Mines, United States of America
• Museo della Civiltà Contadina, Italy
• Grotte Conturines, Italy
• Cuevas El Convento, Puerto Rico
• Grotta Conza, Italy
• Cook Museum, United States of America
• Cooper's Cave, United States of America
• Copán, Honduras
• Coral Caverns, United States of America
• Mănăstirea Corbii de Piatră, Romania
• Antro del Corchia, Italy
• Corfu Cave Tour, Greece
• Sentiero e gallerie minerarie del Cornacchino, Italy
• Grottes du Cornadore, France
• Corner Brook Cave, Canada
• Coronado Cave, United States of America
• Cueva Coro Trasito, Spain
• Grotte de la Glacière de Corrençon, France
• Corris Mine Explorers, Great Britain
• Cosmic Caverns, United States of America
• Grotte Cosquer, France
• Mina Costanaza Logrosán, Spain
• Coteau Freedom Mine, United States of America
• Sima de las Cotorras, México
• La Cotte de St Brelade, Great Britain
• Cotton Sinkhole, China
• Coudenberg Palace, Belgium
• Coudersport Ice Mine, United States of America
• Grottes de Cougnac, France
• Gabriel Coulet, France
• The Country Boy Mine, United States of America
• Musée de la Mine Couriot, France
• Dahlonega Courthouse Gold Museum State Historic Site, United States of America
• Couvre Porte, Malta
• Cueva de Covaciella, Spain
• Santa Cueva de Covadonga, Spain
• Cueva de Covalanas, Spain
• Gorges de la Covatanne, Switzerland
• Cove Cave, Great Britain
• Cove Cave, Ireland
• Coxcatlán Cave, México
• Grutas de Coyame, México
• Cracked Lake, Georgia
• Crag Cave, Ireland
• Crater of Diamonds State Park, United States of America
• Craters of the Moon, United States of America
• Grottes de Cravanche, France
• Maison des Pierreux de Crazannes, France
• Creede Underground Mining Museum, United States of America
• Sentier karstique de Crégols, France
• Cresson Mine, United States of America
• Festungsmuseum Crestawald, Switzerland
• Creswell Crags, Great Britain
• Grotte du Crête de Vaas, Switzerland
• Creugenat, Switzerland
• Cricova Galeriile Subterane, Moldova
• Cripta duomo Città di Castello, Italy
• Cripta Basiliana di San Michele, Italy
• Crisson Gold Mine, United States of America
• Grutas de Cristal, Spain
• Grotta dei Cristalli, Switzerland
• Mine Cristal, Canada
• Manastir Crna Reka, Serbia
• Crocodile Harry, Australia
• Molinetto della Croda, Italy
• Abri de Cro-Magnon, France
• Crowborough Caves, Great Britain
• Crow Creek Mine, United States of America
• Crowley Lake Columns, United States of America
• Crown Cave, China
• Cruachan Power Station, Great Britain
• Knights Halls, Israel
• Crvena Stijena, Montenegro
• Crveno Jezero, Croatia
• Crypte archéologique de l’île de la Cité, France
• Crystal Cave, United States of America
• Crystal Caves, Bermuda
• The Crystal Caves, Australia
• Crystal Cave of Farcu Mine, Romania
• Crystal Cave, Iran
• Crystal Ball Cave, United States of America
• Crystal Gold Mine, United States of America
• Crystal Grottoes Caverns, United States of America
• Crystal Lake Cave, United States of America
• Crystal Cave, United States of America
• Crystal Onyx Cave, United States of America
• Crystal Cave Park, United States of America
• Crystal Shrine Grotto, United States of America
• Crystal Caverns at Hupp's Hill, United States of America
• Crystal Cave, United States of America
• Cserszegtomaj barlang, Hungary
• Csodabogyós-barlang, Hungary
• Csolnoki Bányászklub Múzeum, Hungary
• Cuarenta Casas, México
• Cuarto-Cuarto Cave, The Philippines
• Cuatro Puertas, Spain
• Cub Run Cave, United States of America
• Cüceler Mağarası, Turkey
• Củ Chi Tunnels, Vietnam
• Cueva Cuesta Palmarito, México
• Grutas de Cuetzalan, México
• La Cuevona, Spain
• Cova es Cuilleram, Spain
• Çukurören Yeraltı Şehri, Turkey
• Cullinan Mine, South Africa
• Culver Hole, Great Britain
• Cuma - Antro della Sibilla, Italy
• Cumberland Caverns, United States of America
• Grutas de Cunén, Guatemala
• Curraghmore House, Ireland
• Current River Cavern, United States of America
• Grotta di Curtomartino, Italy
• Grotte Cussac, France
• St Cuthbert's Cave, Great Britain
• Cutta Cutta Caves, Australia
• Cuzamá Cenotes, México
• Cave of Cyclops, Greece
• Cave of the Cyclops, Cyprus
• Sztolnia "Czarny Potok" w Tarnowskich Gorach, Poland
• Da'an Cave, China
• Dabarska pećina, Bosnia and Herzegovina
• Untertageverlagerung Dachs 1, Germany
• Daciyan, China
• Dada Harir Stepwell, India
• Da Dung Mountain Caves, Vietnam
• Daegeumgul, South Korea
• Dahan Stronghold, China
• Roung Dai Ho, Cambodia
• Les gorges du Daillet, Switzerland
• Fort de Dailly, Switzerland
• Daimasu shonyudo, Japan
• Daisekirinzan, Japan
• Dakhovskaya Cave, Russia
• Għar Dalam, Malta
• Heidenkapelle, France
• Dalton Gang Museum and Escape Tunnel, United States of America
• Damanhur Temple, Italy
• Cueva de Damas, Costa Rica
• Damawewe, Papua New Guinea
• Peştera Dambovicioara, Romania
• Dambulla, Sri Lanka
• Damlatas Magarasi, Turkey
• Dan-yr-Ogof - National Showcaves Centre for Wales, Great Britain
• Dandak Gufa, India
• Daneilshöhle, Germany
• Danger Cave, United States of America
• Dannemora Gruvor, Sweden
• Darband Cave, Iran
• Wadi Darbat Falls, Oman
• Darby's Cave, Antigua & Barbuda
• Grotte de Dargilan, France
• La Mina de Daroca, Spain
• Darwin WWII Oil Storage Tunnels, Australia
• Miniere di Darzo, Italy
• Dashiwei Tiankeng, China
• Dat Taw Gyaint Waterfall, Myanmar
• Dat Taw Taung Cave, Myanmar
• Daugbjerg Kalkgruber, Denmark
• Hang Đầu Gỗ, Vietnam
• Daveli's Cave, Greece
• David Gareja, Georgia
• David Hasselhoff Museum, Germany
• Daxiangshan Grottoes, China
• Historic Daydream Mine, Australia
• Dazu Grottoes, China
• D Dupleks, Latvia
• Dead Man's Cave, Great Britain
• Dean Heritage Centre, Great Britain
• Dean's Blue Hole, Bahamas
• Central Deborah Gold Mine, Australia
• De Castellane, France
• Musée du Patrimoine Industriel et Minier, France
• Dechenhöhle, Germany
• Decorah Ice Cave, United States of America
• Dedeli Konak, Turkey
• Deedote Blue Lagoon, Myanmar
• Gua Payau, Malaysia
• Deer Creek Narrows, United States of America
• Deer Lick Cave, United States of America
• Deinhard Kellermuseum, Germany
• Dekor 1 Gypsum Mine, Russia
• Delaware Copper Mine, United States of America
• De Leon Springs, United States of America
• Délirium Café, Belgium
• Delprats Underground Tourist Mine, Australia
• Demanovska L'adova Jaskyna, Slovakia
• Demanovska Jaskyna Slobody, Slovakia
• Demeter's Crypt, Russia
• Demir Baba, Bulgaria
• Grotte des Demoiselles, France
• Denisova, Russia
• Derinkuyu Yeraltı Şehri, Turkey
• Derlon Hotel Museum Cellar, Netherlands
• Desert Cave Hotel, Australia
• Deutsches Bergbau Museum, Germany
• Deutsches Bunkermuseum, Germany
• Deutsches Goldmuseum, Germany
• Deutsches Museum, Germany
• Abenteuer Bergwerk Bernsteinzimmer, Germany
• Devetashka peshtera, Bulgaria
• Grotte de la Devèze, France
• Devil's Bridge, Antigua & Barbuda
• Devil's Den Cave, United States of America
• Devil's Den, United States of America
• Devil's Den, United States of America
• Devil's Hole, Bermuda
• Devil´s Hole, Great Britain
• Devil's Icebox Cave, United States of America
• Devil's Ice Box, United States of America
• Devil’s Millhopper, United States of America
• Devil's Punchbowl, Great Britain
• Devil's Sinkhole, United States of America
• Devil's Well, United States of America
• Dewstow Gardens and Grottoes, Great Britain
• Dhank Caves, India
• Cueva del Diablo, Bolivia
• Caverna do Diabo, Brazil
• Cueva del Diabolo, Spain
• Diamante Falls, Costa Rica
• Diamond Caverns, United States of America
• Diamond Cave, Japan
• Hotel Diar el Barbar, Tunisia
• Pozzo del Diavolo, Italy
• Dich Long Cave and Pagoda, Vietnam
• Didyma Caves, Greece
• Lekėčių Didysis šaltinis, Lithuania
• Diebeshöhle, Germany
• Diefenbunker, Canada
• Karsthöhle Dienstedt, Germany
• Burghöhle Dietfurt, Germany
• Mina La Dificultad, México
• Digger's Dream Underground Home, Australia
• Dike Paku Gupha, Nepal
• Diktaion Antron, Greece
• Diktaeon Cave, Greece
• Dilek Magarasi, Turkey
• Dim Magarasi, Turkey
• Dimbulagala, Sri Lanka
• Dimnice Jama, Slovenia
• Dinosaur Caves Park, United States of America
• Caverna del Dio Mithra, Italy
• Fosse Dionne, France
• Gorges de la Diosaz, France
• Diósgyör-Tapolca barlang, Hungary
• Di Shui Dong, China
• Diu Diu Cave, Papua New Guinea
• Divaška Jama, Slovenia
• Divje Jezero, Slovenia
• Divnogorsky Uspensky Cave-Monastery, Russia
• Dixie Caverns, United States of America
• Đalovića Pecina, Montenegro
• Djara Cave, Egypt
• Djavolskoto Garlo Cave, Bulgaria
• Djevojačka Pećina, Bosnia and Herzegovina
• Djurovica Jama, Croatia
• Přečerpávací vodní elektrárna Dlouhé Stráně, Czech Republic
• Do-Ashcaft Cave, Iran
• Siju Dobakhol, India
• Dobroselički Prerast, Serbia
• Dobrostan Pearl Cave, Bulgaria
• Dobsinska Ladova Jaskyna, Slovakia
• Doktorshöhle, Germany
• Dolaucothi Gold Mine, Great Britain
• Dolinenweg Hengen, Germany
• Doling Cave, United States of America
• Dolní Vĕstonice, Czech Republic
• Dombashawa Rocks and Painted Cave Site, Zimbabwe
• Gurra Antike e Domgjonit, Albania
• Jaskyna Domica, Slovakia
• Dom Im Berg, Austria
• Grotte de Domme, France
• Maison du Fer à Dompierre, France
• Muches de Domqueur, France
• DOMunder, Netherlands
• Donauversickerung, Germany
• Cueva de Don Juan, Spain
• Cueva de Don Justo, Spain
• Donnersbachklamm, Austria
• Doolin Cave, Ireland
• Dorawaka Ethubandi Cave, Sri Lanka
• Dorfbachklamm, Germany
• Dorking Caves, Great Britain
• Eisstollen Dornburg, Germany
• Dorohacchō Gorge, Japan
• Dorotheastolln, Germany
• Dos Brazos de Rio Tigre, Costa Rica
• Doseongul, South Korea
• Cueva de las dos Puertas, Spain
• Miniere di Dossena, Italy
• Grotta dei Dossi, Italy
• Fort de Douaumont, France
• Source du Doubs, France
• Dougout Ranch, United States of America
• Tham Doun, Laos
• Dover Stone Church, United States of America
• Dowa Rajamaha Viharaya, Sri Lanka
• Down to Erth, Australia
• Cuevas del Drach, Spain
• Drachenhöhle, Austria
• Drachenloch, Switzerland
• Eisenacher Drachenschlucht, Germany
• Gruta del Drago, Panama
• Caverne du Dragon, France
• Dragon Cave, China
• Grotta della Dragonara, Italy
• Dragon Hall Undercroft, Great Britain
• Dragon Hole, China
• Cave Of The Dragon Kastoria, Greece
• Museo Cueva de Dragut, Spain
• Drakelow Tunnels, Great Britain
• Drakospilia, Greece
• Drakonina Pecina, Croatia
• Grotte de la Draye Blanche, France
• Dreidärrischenhöhle, Austria
• Dreieingangshöhle, Germany
• Drei Kronen & Ehrt, Germany
• Wasserfall Dreimühlen, Germany
• Schwerspatmuseum Dreislar, Germany
• Muzey Drevnego Cheloveka, Russia
• Drilon Spring, Albania
• Jaskyna Driny, Slovakia
• Drive-in Mine, Australia
• Spilaio Drogkarati, Greece
• Les Drois Glands, Luxembourg
• Druidenhain, Germany
• Grotte des Druides, France
• Dubočka Pećina, Serbia
• Ducktown Basin Museum, United States of America
• Hang Đức Mẹ, Vietnam
• Dudley Canal Tunnels, Great Britain
• La Gruta Del Duende, México
• Historisches Kuperbergwerk Düppenweiler, Germany
• Museumsbunker Düppenweiler, Germany
• Duivelsgrot, Netherlands
• Duman, Bosnia and Herzegovina
• Dumdalen Grotter, Norway
• Dunaskin Open Air Museum, Great Britain
• Dunbar Cave, United States of America
• Duncan Escarpment, Canada
• Dungeshwari, India
• Dunhuang Mogao Caves, China
• Dunmore Caves, Ireland
• Dunning's Spring, United States of America
• Dunsthöhle, Germany
• Dunston Cave, Trinidad and Tobago
• Dupnisa Mağarası, Turkey
• Dupont Underground, United States of America
• Paseo Túnel Minería Durango, México
• Dureb Caves, Namibia
• Durham Mining Museum, Great Britain
• Gorges du Durnand, Switzerland
• Peștera Duruitoarea, Moldova
• Dust Devil Mine, United States of America
• Dva Oka, Croatia
• Dyavolski Most, Bulgaria
• Dyrhólaey, Iceland
• Dzibilchaltún Cenote, México
• Cenote Dzitnup, México
• Jaskinia Ku Dziurze, Poland
• Cenote Dzonbacal, México
• Eagle Cave, United States of America
• Eagle and High Peak Mine, United States of America
• Tomb of the Eagles, Great Britain
• Eaik Sa Ta Ya Cave, Myanmar
• Earby Mining Museum, Great Britain
• East Pool Mine, Great Britain
• Eastwater Cavern, Great Britain
• Ebbor Gorge, Great Britain
• Grotte d'Ebbou, France
• Eberstadter Tropfsteinhöhle, Germany
• Echidna Chasm, Australia
• Echo Caves, South Africa
• Echo Amphitheater, United States of America
• Eckert James River Cave, United States of America
• Eckley Miners’ Village, United States of America
• Gruta dos Ecos, Brazil
• Ecton Mine Educational Centre, Great Britain
• Edakkal, India
• Besucherstollen Grube Edelstein, Germany
• Mina El Edén, México
• Edessa Waterfalls Cave, Greece
• CSM Edgar Experimental Mine, United States of America
• Kasematte Edling Süd, France
• Edna May Gold Mine, Australia
• Egkleistra, Cyprus
• Eglise monolithe Saint Jean, France
• Egloffsteiner Felsenkeller, Germany
• Musée des Égouts, Belgium
• Ehnbachklamm, Austria
• Zinngrube Ehrenfriedersdorf, Germany
• Eichener See, Germany
• Bunker Eichenthal, Germany
• Ein Gedi, Israel
• Einhornhöhle, Germany
• Einhornhöhle, Austria
• Einödhöhle, Austria
• Eisenbreche Klamm, Germany
• Eisensteinstollen, Germany
• Eisensteinhöhle, Austria
• Eisinger Löcher, Germany
• Eiskapelle, Germany
• Eiskogelhöhle, Austria
• Eispalast Jungfraujoch, Switzerland
• Dachstein Eispalast, Austria
• Eispavillon Mittelallalin, Switzerland
• Eisriesenwelt, Austria
• Cueva de Ekain, Spain
• Ekotechnické Museum, Czech Republic
• El-Haouaria, Tunisia
• El Arcotete Parque Ecoturístico, México
• El Capitan Cave, United States of America
• El Capulín Natural Pool, El Salvador
• Cuevas de El Castillo y Las Monedas, Spain
• El Cerrejón Coal Mine, Colombia
• Cueva El Chorreadero, México
• Coves del Cogul, Spain
• Cueva de El Conejar, Spain
• Eldorado Canyon Mine Tours, United States of America
• Electric Mountain Visitor Centre, Great Britain
• Grutas el Encanto, Guatemala
• Elephanta Caves, India
• Bodega El Fabulista, Spain
• Elfengrotte, Germany
• Elijah’s Cave, Israel
• Elkep Evi Cave Houses, Turkey
• Ice Caves Mountain, United States of America
• Jaunpils Elles Kalns, Latvia
• Spilea Ellinokamára - Ellinokamára Cave, Greece
• Ellinwood Underground Tunnels, United States of America
• Elliot Lake Nuclear and Mining Museum, Canada
• Elliott Underground Quarry, United States of America
• Ellora Caves, India
• El Majé Caves, Panama
• El Malpais National Monument, United States of America
• El Meson de la Cava, Dominican Republic
• El Nicho Waterfall & Cave, Cuba
• Cueva de El Pendo, Spain
• El Puente Natural, Panama
• Cavernas El Sauce, Argentina
• El Tajo Canyon, Spain
• Coves del Toll, Spain
• El Torcal de Antequera, Spain
• El Zanjón de Granados, Argentina
• Emerald Village, United States of America
• Emilianusstollen, Germany
• Pestera Emil Racovita, Moldova
• Muzeul de Speologie "Emil Racoviţă", Romania
• Emine Bair Khasar Cave, Russia
• Emmaville Mining Museum, Australia
• Empire Mine State Historic Park, United States of America
• Empire Cave, United States of America
• Laguna Encantada, Guatemala
• Gruta das Encantadas, Brazil
• Poço Encantado, Brazil
• Enchanted Cave, The Philippines
• Endless Caverns, United States of America
• Cueva de Los Enebralejos, Spain
• Maison du Mineur et des Énergies, France
• Engelsbergs Bruk, Sweden
• Engenlochschlucht, Austria
• Schieferbergwerk im Engi, Switzerland
• Englebrecht Cave, Australia
• Enku Bora, Japan
• Enoshima Iwaya Cave, Japan
• Grotta Entella, Italy
• Enterprise Pit Mine Lookout, Australia
• Entrische Kirche, Austria
• Furna do Enxofre, Portugal
• Le Blockhaus d'Éperlecques, France
• Eshab-i Kehf - Grotto of Seven Sleepers, Turkey
• Musée de la mine Epinac, France
• Grotte d'Eprave, Belgium
• Grotte di Equi Terme, Italy
• Eramosa Karst, Canada
• Steinerne Rinne bei Erasbach, Germany
• Tham Erawan, Thailand
• Erawan Falls, Thailand
• Bergbau- und Heimatmuseum Erbendorf, Germany
• Erbendorfer Felsenkeller, Germany
• Karstlehrpfad Breitscheid-Erdbach, Germany
• Erdmannshöhle, Germany
• Bunker WH-767 “Erlkönig”, Germany
• Erma Gorge, Bulgaria
• Museo Minero de Riotinto "Ernest Lluch", Spain
• Stollen Erwein II, Germany
• Erzberg, Austria
• Tropfsteinhöhle Erzenhausen, Germany
• Esbelli Evi, Turkey
• Musée de la mine d’Escaro-Aytua, France
• Musée de la mine et des traditions populaires d'Escaudain, France
• Casemate Esch, France
• Minera Escondida, Chile
• Cenote Escondido, México
• Gruta do Escoural, Portugal
• Eski-Kermen, Russia
• Gouffre d'Esparros, France
• Esperhöhle, Germany
• Santuario Virgen de la Esperanza, Spain
• Gruta del Espiritu Santo, El Salvador
• La Cueva del Esplendor, Colombia
• Balma d'Esplugues, Spain
• Essex Secret Bunker, Great Britain
• Esterlin, France
• Grutas de la Estrella, México
• Esztáz-kői-barlang, Hungary
• Museo Nazionale Etrusco, Italy
• Cascade d’Étufs, France
• Musée Eugène Pesch, Luxembourg
• Mina Eugènia, Spain
• Tunnel of Eupalinus, Greece
• Eureka Tunnel, United States of America
• Eureka Springs Underground, United States of America
• Cave of Euripides, Greece
• Euston Lost Tunnels, Great Britain
• Evakueringshulen, Norway
• Sentier karstique à Excideuil, France
• Exeter's Underground Passages, Great Britain
• Expo Cave Karst, Slovenia
• Centro de Interpretación de la minería en Extremadura, Spain
• Eysturoyartunnilin, Faroe Islands
• Gruta da Fada, Brazil
• Gouffre de la Fage, France
• Museo Faggiano, Italy
• Fairy Cave, Malaysia
• Buchan Caves - Fairy Cave, Australia
• Fakıllı Mağarası, Turkey
• Bunker Falkenhagen, Germany
• Falkensteiner Höhle, Germany
• Falkirk Mine, United States of America
• Falling Waters Sink, United States of America
• Knappenloch Fallwindes, Austria
• Grotte di Falvaterra, Italy
• Cueva del Fantasma, Venezuela
• Fantastic Caverns, United States of America
• Fantasy Cave, Bermuda
• Faqra Natural Bridge, Lebanon
• I Faraglioni, Italy
• Fardrum Lough, Roosky Lough, and Green Lough, Ireland
• Grotte à Farinet, France
• Faris Caves, United States of America
• Farm8, South Korea
• Grotta del Farneto, Italy
• Centro de Interpretación de la Fauna Glacial, Spain
• Le Faux Saulnier, France
• Fayes Underground Home, Australia
• Centre Minier de Faymoreau, France
• Buchan Caves - Federal Cave, Australia
• Federal Reserve Bank of New York Gold Vault, United States of America
• Feengrotten, Germany
• Grotte aux Fées, Switzerland
• Grube Feggendorfer Stolln, Germany
• Felicitas Heilstollen, Germany
• Mina Felipe dos Santos, Brazil
• Besucherbergwerk Fell, Germany
• Fels Cave, Vanuatu
• Österreichisches Felsbildermuseum, Austria
• Felsendome Rabenstein, Germany
• Nürnberger Felsengänge, Germany
• Felsenkirche Idar-Oberstein, Germany
• Hemer Felsenmeer, Germany
• Gruta do Fendão, Brazil
• Fengyu Cave, China
• Cisterne Romane Fermo, Italy
• Fern Grotto, United States of America
• Fern and Roman Caves, Great Britain
• La Ferrassie, France
• Ferreira's Mine, South Africa
• Ferropolis, Germany
• Fertőrákosi Barlangszínház, Hungary
• Poço Fervedouro, Brazil
• Špilja Feštinsko Kraljevstvo, Croatia
• Lycian Tombs at Fethiye, Turkey
• Feuchter Keller, Austria
• Grotta del Fico, Italy
• Gorges du Fier, France
• Fig Tree Cave, Australia
• Fikirini Three Sister Caves, Kenya
• Filipinas Larimar Mine, Dominican Republic
• St Fillan's Cave, Great Britain
• Domaine Filliatreau, France
• Caves of Filopappou Hill, Greece
• Finca Ixobel River Cave Trip, Guatemala
• Finca las Minas, Costa Rica
• Cova de les Finestres, Spain
• Fingal's Cave, Great Britain
• Finnforsrövarnas grotta, Sweden
• Finnich Glen, Great Britain
• Finsteres Loch, Germany
• Besuchsbergwerk Finstergrund, Germany
• Schaubergwerk "Finstertal" Asbach, Germany
• Grotta Fioravante, Italy
• Fire Clay Caverns, Australia
• Fisher Cave, United States of America
• Fisher's Cave, United States of America
• Fish River Canyon, Namibia
• Sorgente Fiumelatte, Italy
• Five Dragon Pool, China
• Five-Flower Lake, China
• Flaat Nikkelgruve, Norway
• Flagstaff Lava River Cave, United States of America
• Musée des Mines et des Carrières à Flamanville, France
• Flascharův důl, Czech Republic
• Flogbergets gruva, Sweden
• Grottes de Floreffe, Belgium
• Florence Mine Heritage Centre, Great Britain
• Florida Caverns State Park, United States of America
• Florida Museum of Natural History, United States of America
• Parco Minerario Floristella Grottacalda, Italy
• Flour Cave, Israel
• Floyd Collins’ Crystal Cave, United States of America
• Flume Gorge, United States of America
• Fluweelengrot, Netherlands
• Gruta do Fogo, Brazil
• Fohlenhaus, Germany
• Bergbaumuseum Fohnsdorf, Austria
• Grotte de Foissac, France
• Elos Fokianou, Greece
• Folldal Gamle Gruver, Norway
• Grottes de Folx-Les-Caves, Belgium
• Parc Industriel et Ferroviaire du Fond-de-Gras, Luxembourg
• Le Fondry Des Chiens, Belgium
• José Maria da Fonseca Wine Cellars, Portugal
• Grotte de Font-de-Gaume, France
• Cisterna della Fontana del Calamo, Italy
• Cimitero delle Fontanelle, Italy
• Sentier Karstique Font d’Urle, France
• Fontein Grot, Aruba
• Minas Fonte Meu Bem Querer, Brazil
• Fontaine de Fontestorbes, France
• Abbaye Royale de Fontevraud, France
• Nacimiento del Rio Ebro, Spain
• Grottes de Fontirou, France
• Cova de la Font Major, Spain
• Grotte de Fontrabiouse, France
• Footwhistle Glowworm Cave, New Zealand
• Cova Forada, Spain
• Forbidden Caverns, United States of America
• Forchheimer Keller, Germany
• Criptoportico Forense, Italy
• Forestiere Underground Gardens, United States of America
• L'Aven Grotte de la Forestière, France
• Formula Center, Finland
• La Fornace di Barbablù, Italy
• Foros Cave, Greece
• Strada della Forra, Italy
• Fort Amherst Tunnel Tour, Great Britain
• Fort Bonifacio Tunnel, The Philippines
• Fort Casso, France
• Forteiland, Netherlands
• Fort Hommet Gun Casemate, Great Britain
• Fort Rock Cave, United States of America
• Fort Stanton Cave, United States of America
• Grube Fortuna, Germany
• Parco Archaeologico Forza, Italy
• La Fosse de Forges, France
• Gorges de la Fou, France
• Grotte du Foulon, France
• Fountain Cave, United States of America
• Fountain Cavern, Anguilla
• Ouvrage du Four-à-Chaux, France
• Les mines d'argent du Fournel, France
• Fox River Caves, New Zealand
• Höhlenburg Fracstein, Switzerland
• Spilaion Frahthi - Frahthi Cave - Franchthi Cave, Greece
• Cueva de los Franceses, Spain
• Francetova Jama, Slovenia
• Franciscan Monastery, United States of America
• Francisco Dagohoy Cave, The Philippines
• Tomba Francois, Italy
• François Leguat Giant Tortoise and Cave Reserve, Mauritius
• Frank Aston Underground Museum, Australia
• Franklin Mineral Museum & Mine Replica, United States of America
• Franklin Court Underground Museum, United States of America
• Frantoi Ipogei di Grottaglie, Italy
• Frantoio Ipogeo Granafei, Italy
• Frantoio Ipogeo Caffa, Italy
• Frantoio Ipogeo Sternatia, Italy
• Grotta Grande del Vento - Grotte di Frasassi, Italy
• Tempio del Valadier - Santa Maria di Frasassi - Infrasaxa - Grotte di Frasassi, Italy
• Höhlenmuseum Frasdorf, Germany
• Grotta dei Frati, Italy
• Frauenmauerhöhle, Austria
• Free Enterprise Health Mine, United States of America
• Stadt- und Bergbaumuseum Freiberg, Germany
• Furna de Frei Matias, Portugal
• Schaubergwerk St. Anna am Freudenstein, Germany
• Heilklimastollen Friedrich, Austria
• Friedrich-Wilhelm-Stollen, Germany
• Frihedsmuseet, Denmark
• Gouffre Friouato, Morocco
• Eisenerzbergwerk Frischglück, Germany
• Fröå gruva, Sweden
• Fromosa Boulevard Station, China
• Fucha, Japan
• Fudo-kutsu, Japan
• Cuevas de Fuentemolinos, Spain
• Cuevas de Fuentes de Leon, Spain
• Festung Fürigen, Switzerland
• Fürstenzeche, Germany
• Grüner Bräu Keller, Germany
• Fugaku Fuketsu, Japan
• Fugoppe-dokutsu, Japan
• Führerbunker, Germany
• Fuji-do, Japan
• Fukiya Copper Mine, Japan
• Fukuchani Ruins & Cave, Tanzania
• Fukui Cave, Japan
• Fulford Cave, United States of America
• Portail de Fully, Switzerland
• Gruta da Fumaça, Brazil
• Musée de l'ardoise de Fumay, France
• Funakubo Shonyudo, Japan
• Funatsu Tainai, Japan
• Fun Fun Cave, Dominican Republic
• Lough Funshinagh, Ireland
• Funtana Chistagna, Switzerland
• Funtensee, Germany
• Furaku Cave, Japan
• Furen shonyudo, Japan
• Parc National de Furfooz, Belgium
• Gola del Furlo, Italy
• Gruta da Furninha, Portugal
• Furong Dong, China
• Futenma Cave, Japan
• Fuyang Cave, China
• Silberstollen Gabe Gottes, Germany
• Sorgente del Gabriele, Italy
• Gadara, Jordan
• Goa Gajah, Indonesia
• Gorge de Galamus, France
• Galazia Spiliá - Blue Grotto, Greece
• Galázia Spiliá, Greece
• Galázia Spiliá - Blue Grotto - Korithi Cave, Greece
• Cueva de la Galiana, Spain
• Grotta della Galleria Ferroviaria, Italy
• Venta El Gallo, Spain
• Gamaoreum Japanese Cavern Site, South Korea
• Miniera Gambatesa, Italy
• Gamirasu Otel, Turkey
• Pozzo di Gammazita, Italy
• Sinks of Gandy, United States of America
• Gavi Gangadhareswara, India
• Valley of Gangala, Japan
• Gangcha Cave, China
• Gankutsu Hotel, Japan
• Knappenloch Ganotz, Austria
• Gap Cave, United States of America
• Gaping Ghyll, Great Britain
• Grutas de Garcia, México
• Garden Of Caves, India
• Gardner Cave, United States of America
• Sea Caves of the Gargano, Italy
• Grottes Prehistorique de Gargas, France
• Gole del Garrafo, Italy
• Garvanitsa, Bulgaria
• Atombunker Garzau, Germany
• Gasparee Caves, Trinidad and Tobago
• Gassel-Tropfsteinhöhle, Austria
• Gasteiner Heilstollen, Austria
• Gatklettur, Iceland
• Cueva del Gato, Spain
• Gaub Cave, Namibia
• La Grotte de Gaulier, France
• Store Gaulstadgrotta, Norway
• Gautschgrotte, Germany
• Mines Prehistòriques de Gavà, Spain
• Pozo del Gavilán, México
• Parco Minerario Naturalistico di Gavorrano, Italy
• Gaxian Dong, China
• Gaziemir Yer Altı Şehri, Turkey
• Mestská a naftárska expozícia Gbely, Slovakia
• Gcwihaba Caverns, Botswana
• Geevor Tin Mine, Great Britain
• Geghard, Armenia
• Geikie Gorge, Australia
• Geissenklösterle, Germany
• Gua Gelatik, Indonesia
• Cave Church at Gellért Hill, Hungary
• Banícke Múzeum Gelnica, Slovakia
• Grotta del Gelo, Italy
• Gemeentegrot, Netherlands
• Gemini Bridges, United States of America
• Gems Museum, Myanmar
• Caverne Gendarme, France
• Les Caves de la Genevraie, France
• Cueva de Genova, Spain
• Grotta del Genovese, Italy
• Genovevahöhle bei Bell, Germany
• Genovevahöhle bei Kordel, Germany
• Museo dei Minerali della Gente di Rio, Italy
• Genzan-kutsu, Japan
• Geophysical Cave, Russia
• Förderturm der Grube Georg, Germany
• George's Gold Mine, Australia
• Geraer Höhler, Germany
• Spilaion Gerani, Greece
• Jersey War Tunnels, Great Britain
• German Naval Signals Headquarters, Great Britain
• German Underground Hospital, Great Britain
• La Grotta Dei Germogli, Italy
• Carriere souterraine de Gèromont, Belgium
• Erzweg Gersdorf, Germany
• Kristallkluft Gerstenegg, Switzerland
• Grotto of Gethsemane, Israel
• Getu River Caves, China
• Geulhemmergroeve, Netherlands
• Ghardaia, Algeria
• Peştera Ghetarul Focul Viu, Romania
• Ghorawadi Caves, India
• Giant Springs, United States of America
• Giant's Cave, Great Britain
• Giants Cave, Australia
• Gießenbachklamm, Germany
• Grotta Gigante, Italy
• La Cueva del Gigante, Honduras
• Cuevas del Gigante, Spain
• Gihon Spring, Israel
• Gila Cliff Dwellings, United States of America
• Gilfenklamm, Italy
• Giligili Cave, Papua New Guinea
• Gillberga Gryte, Sweden
• Gilmerton Cove, Great Britain
• Gimhae Wine Cave, South Korea
• Gimnyeongsagul, South Korea
• Gimpel-Labyrinth, Austria
• Ginryu-do, Japan
• Der Karstwanderweg am Südharz, Germany
• Goa Giri Putri Temple, Indonesia
• Musée de la Mine et des Techniques Minière de Giromagny, France
• Grotta Giusti Terme, Italy
• Gjabakkahellir, Iceland
• Gjøvik Olympic Mountain Hall, Norway
• Grotte de la Glacière, France
• Cave of Padre Glandorff, México
• Grube Glasebach, Germany
• Quellflur Kalksinter Glatt, Germany
• Jaskinia Głęboka, Poland
• Gleirschklamm, Austria
• Besucherbergwerk Gleissinger Fels, Germany
• Glenamaddy Turlough, Ireland
• Glengowla Mines, Ireland
• Glen Osmond Mine Tour, Australia
• Glenwood Caverns, United States of America
• Gletscherschlucht, Switzerland
• Glifada, Greece
• Schaubergwerk Frisch Glück Glöckl, Germany
• Gruta da Glória, Brazil
• Glory Hole Waterfall, United States of America
• Quarzitbruch Glossen, Germany
• Waitomo Glowworm Grotto, New Zealand
• Schaubergwerk „Gnade Gottes Erbstollen“, Germany
• Go Below Underground Adventures, Great Britain
• God's Bridge, Great Britain
• Daraja la Mungu, Kenya
• God's Bridge, Great Britain
• God's Bridge, Great Britain
• Daraja la Mungu Kiwira, Tanzania
• Göpfelsteinhöhle, Germany
• Mine d'antimoine à Goesdorf, Luxembourg
• Besucherbergwerk Im Gößner, Germany
• Goetz-Höhle, Germany
• Götzingerhöhle, Germany
• Gökgöl Magarasi, Turkey
• Gokuraku-do, Japan
• Goldbergbaumuseum Goldkronach, Germany
• GoldBottom Mine Tours, Canada
• Gold Bug Mine, United States of America
• Gold Dredge 8, United States of America
• Golden Cathedral, United States of America
• Goldfield Mine, United States of America
• Museum of the Goldfields, Australia
• Besucherbergwerk Goldhausen, Germany
• Gold King Mine, United States of America
• Gold Reef City, South Africa
• Gold Road Mine Tours, United States of America
• Große und Kleine Golke, Germany
• Sorgenti Su Gologone, Italy
• Sótano de las Golondrinas, México
• Cueva de las Golondrinas, Puerto Rico
• Cueva Golondrinas, Puerto Rico
• Golub Špilja, Croatia
• Golubinsky Proval, Russia
• Golubnjaca Pecina, Croatia
• Blue Lake, Russia
• Goluboye Ozero, Russia
• Golubovitsa Cave, Bulgaria
• Goluboye Ozero Kabardino, Russia
• Goluboye Ozero Samara, Russia
• Gomantong Caves, Malaysia
• Gombasecka Jaskyna, Slovakia
• Gonawatta Ancient Caves, Sri Lanka
• Goldmine Gondo, Switzerland
• Goa Gong, Indonesia
• Eisenbergwerk Gonzen AG, Switzerland
• Good Enough Mine, United States of America
• Good Luck Cave, Malaysia
• Goodluck Mine, Great Britain
• Great Ocean Road, Australia
• Görbehalmi Bányamúzeum, Hungary
• Gorge Underground, United States of America
• Fuente del Gorgotón, Spain
• Skansen Przemysłu Naftowego „Magdalena” w Gorlicach, Poland
• Gornerschlucht, Switzerland
• Muzeum Górnictwa Węglowego, Poland
• Manastir Gornjak, Serbia
• Gornjepoljski Vir, Montenegro
• Ecomuseo Miniere di Gorno, Italy
• Gort River, Ireland
• Gossi Cave, South Korea
• Gosu Cave, South Korea
• Goto Mall, South Korea
• Gottesackerplateau, Germany
• Gotthard Basistunnel, Switzerland
• Gorges de Gouleyrous, France
• Vallée troglodytique des Goupillières, France
• Gouvernéto Cave - Bears' Cave, Greece
• Grotte de Goyet, Belgium
• Göynük Canyon, Turkey
• Goyomatsu shonyudo, Japan
• Gruvmuseet Grängesberg, Sweden
• Besucherbergwerk Graf Wittekind, Germany
• Graham Cave, United States of America
• Mina de Gramado, Brazil
• Granatium, Austria
• Gran Cenote, México
• Grand Caverns, United States of America
• Grand Arch, Australia
• Grand Canyon Caverns, United States of America
• Grand Canyon, United States of America
• Maison du Mineur Grand-Combe, France
• Les Grandes Canalettes, France
• Le Grand Filon, France
• Grandfontaine Musée Minéralogique et Minier, France
• Grand Gulf State Park, United States of America
• Grotte du Grand Roc, France
• Grands Goulets, France
• Grand Staircase – Escalante National Monument, United States of America
• Caverna La Gran Galería, Costa Rica
• Grapčeva Špilja, Croatia
• Graselhöhle, Austria
• Parco Naturale del Rio Grassano, Italy
• Grasslhöhle, Austria
• Champagne Alfred Gratien, France
• Bergbaumuseum Graubünden, Switzerland
• Maisons troglodytes du Graufthal, France
• Gravina Sotterranea, Italy
• Great Cave, Cayman Islands
• Great Chamber, United States of America
• Great Masson Cavern, Great Britain
• Great Onyx Cave, United States of America
• Great Orme Bronze Age Copper Mines, Great Britain
• Great Rutland Cavern, Great Britain
• Great Siege Tunnels, Great Britain
• Underground Great Wall, China
• Greenbrier Bunker, United States of America
• Green Grotto Caves, Jamaica
• Green's Cave, United States of America
• Greenwich Foot Tunnel, Great Britain
• Greeves Creek, Australia
• Greig's Scenic Caves, Canada
• Caves Louis de Grenelle, France
• Grgosova Špilja, Croatia
• Griffener Tropfsteinhöhle, Austria
• Schaubergwerk am Grillenberg, Austria
• Grimes Graves, Great Britain
• Felslabor Grimsel, Switzerland
• Kraftwerk Grimsel 2, Switzerland
• Grjótagjá, Iceland
• Grofova Jama, Slovenia
• Gronligrotta, Norway
• Groppenstein- und Rabisch-Schlucht, Austria
• Große Grotte, Germany
• Großer Lochstein, Germany
• Große Scheuer, Germany
• Grotesquery, Czech Republic
• Maria SS. Addolorata a Grottasanta, Italy
• Grottenaquarium, Netherlands
• Höhlenburg Grottenstein, Switzerland
• The Grotto, Australia
• The Grotto, Northern Mariana Islands
• The Grove Park Inn, United States of America
• Gruebisbalm Höhle, Switzerland
• Gründelsloch, Germany
• Vereinsbergwerk Grüner Zweig, Germany
• Erlebniswelt am Grünten, Germany
• Gruve 3, Norway
• Gruve 7, Norway
• Gruvkapellet, Sweden
• Grza, Serbia
• Guacara Taina, Dominican Republic
• Cueva del Guácharo, Venezuela
• Cueva de los Guácharos, Colombia
• Cueva de los Guácharos del Rio Claro, Colombia
• Cueva de los Guacharos, Perú
• Catacumbas de Guadalajara, México
• Guadirikiri Grot, Aruba
• Guadix Cave Houses, Spain
• Cueva de Guahedum, Spain
• Guajataca Forest, Puerto Rico
• Cueva de Gualicho, Argentina
• Guanma Dong, China
• Jinzhou Guanyin Dong, China
• Guanyindong, China
• Xixiu Guanyin Dong, China
• Yandang Guanyin Dong, China
• Haitón del Guarataro, Venezuela
• Barranco de Guayadeque, Spain
• Magic White Caves of Gudvangen, Norway
• Grosser Atomschutz-Bunker in Güdingen, Germany
• Bergbaumuseum und Besucherbergwerk Grube Günnersdorf, Germany
• Musée des Gueules Rouges, France
• Guhantara, India
• Miniera d'Oro della Guia, Italy
• Zwiedzanie Kopalni Guido, Poland
• Guildhall Medieval Crypt, Great Britain
• Guimit Cave, The Philippines
• Guinogo-an Cave, The Philippines
• Cueva de las Güixas, Spain
• Gujo Limestone Cave, Japan
• Guler Ice Caves, United States of America
• Gunnadoo Gold Mine, Australia
• Gunns Plains Caves, Australia
• Gunung Senyum Caves, Malaysia
• Hilfskrankenhaus Gunzenhausen, Germany
• Guoliang Wall-Mounted Highway, China
• Gupteswor Mahadev Gufa, Nepal
• Gupteswar Gupha, India
• Gürcüoluk Mağarası, Turkey
• Gurugem Phuk, China
• Gußmannhöhle, Germany
• Grube Gustav, Germany
• Gutenberger Höhle, Germany
• Gutmana Ala, Latvia
• Guyaju Caves, China
• Gwalia Gold Mine, Australia
• Gwangmyeongdonggul, South Korea
• Gýgagjá, Iceland
• Gympie Gold Mining and Historical Museum, Australia
• Gyokusen-do, Japan
• Gyurkó-lápai-barlang, Hungary
• Ha Baroana, Lesotho
• Habis Caves, Lebanon
• Gros Ouvrage A19 Hackenberg, France
• Hack Green Secret Nuclear Bunker, Great Britain
• Hadeland Bergverksmuseum, Norway
• Hadži-Prodanova Pecina, Serbia
• Hänigser Teerkuhlen, Germany
• Haga Tingshus Jättegryta, Sweden
• Bunker Hagen, Germany
• Ha Ha Tonka State Park, United States of America
• Haig Colliery Mining Museum, Great Britain
• Haikong Cave, China
• Hainault Gold Mine, Australia
• Haizhou Mine, China
• Ha Kome Cave Dwellings, Lesotho
• Hakusan Shrine, Japan
• Hakusan Shrine, Japan
• Hakuun-do, Japan
• Musée Minier et Métallurgique de Musson-Halanzy, Belgium
• Mithrasgrotte, Germany
• Bergbaumuseum Hall, Austria
• Halliggye Fogou, Great Britain
• Hallstatt, Austria
• Ħal Saflieni Hypogeum, Malta
• Hálsanefshellir Cave, Iceland
• Hamatoura Monastery, Lebanon
• Hamilton Pool, United States of America
• Hamilton's Caves, Bahamas
• Grotte Hamma, Algeria
• Cuevas de Hams, Spain
• Grottes de Han-sur-Lesse, Belgium
• Hana Lava Tube, United States of America
• Hand and Heart, Great Britain
• Expozícia uhoľného baníctva na Slovenku, Slovakia
• Hang Ma, Vietnam
• Hanibe Caves, Japan
• Hannan's North Tourist Mine - The Mining Hall Of Fame, Australia
• Hantongshan Shenxian Dong, China
• Hanyama No. 2 Tunnel, Japan
• Ta Spilia Harakas, Greece
• Haramiiska Dupka, Bulgaria
• Musée de la Mine d'Harchies, Belgium
• Grua va Hardömbl, Italy
• Hard Rock Vault, Great Britain
• Hard Tack Mine, United States of America
• Hard Times Mine, Australia
• Haritun Cave, Israel
• Sentier Karstique Gouffres d'Harizpé, France
• Spilia Harkadio - Harkadio Cave, Greece
• Harmanecká Jaskyna, Slovakia
• Bunker Harnekop, Germany
• Musée de l'Ecole et de la Mine, France
• Harod Spring, Israel
• Grotte d'Harpea, France
• Harrie Wood Cave, Australia
• Harrison's Cave, Barbados
• Hartford Cave, Bahamas
• Harman 1, Australia
• Hartness House, United States of America
• Harwood's Hole, New Zealand
• Għar Hasan, Malta
• Hashidate shonyudo, Japan
• Hashima Mine, Japan
• Hatchet Bay Cave, Bahamas
• Musée de l'Abri de Hatten, France
• Hatter's Hideout Cave and Lodge, Australia
• Haua Fteah Cave, Libya
• Haunted Cave, United States of America
• Hausertorstollen, Germany
• Les Hautes Roches, France
• Ardoisière Haut-Martelange, Luxembourg
• Havasu Falls, United States of America
• Hawkstone Park, Great Britain
• Monastery of Our Lady of Hawqa, Lebanon
• Shpella e Haxhi Aliut, Albania
• Hazan Caves, Israel
• Hazrat Daud Cave, Uzbekistan
• Heaven Cave, The Philippines
• Besucherbergwerk "Heilige Drei Könige", Germany
• Goldgräberdorf Heiligenblut, Austria
• Heilstollen Nordenau, Germany
• Heimensteinhöhle, Germany
• Heimkehle, Germany
• Heineman Winery - Crystal Cave, United States of America
• Heinrichshöhle, Germany
• Heinrich-Kocher-Stollen, Germany
• Hei Shan Gou, China
• Festung Heldsberg, Switzerland
• Helensburgh Glowworm Tunnel, Australia
• Restaurant l'Hélianthe, France
• Hell Geological Site, Cayman Islands
• Caves of Hella, Iceland
• Hella-Glück-Stollen, Germany
• Hellfire Corner, Great Britain
• Hellnahellir, Iceland
• Hell's Gate, Antigua & Barbuda
• Helme Koopad, Estonia
• Helvetisches Goldmuseum, Switzerland
• Henneth Annûn, Middle-Earth
• Galleria Henry, Italy
• Henry Morgan's Cave, Bahamas
• Herbstlabyrinth-Adventhöhle-System, Germany
• Grottes d'Hercules, Morocco
• Cueva de Hércules, Spain
• Werra-Kalibergbau-Museum Heringen, Germany
• Heritage Gold Mine Park, United States of America
• Herkimer Diamond Mines, United States of America
• Hermannshöhle, Germany
• Hermannshöhle, Austria
• Höhle auf dem Großen Hermannstein, Germany
• Hermit's Cave, Australia
• Grutas los Herrara, México
• Schiefergrube Herrenberg, Germany
• Herts Young Mariners Base, Great Britain
• Herzgruft, Austria
• Eisenbergwerk Herznach, Switzerland
• Hezarmerd Cave, Iraq
• Hezekiah's Tunnel, Israel
• Hibbing Taconite Tours, United States of America
• Hickelhöhle, Germany
• Hida dai-shonyudo, Japan
• Hidden Cave, United States of America
• Hidden Forest Cave, United States of America
• Hidden River Cave, United States of America
• Hidden Worlds Cenotes, México
• Hidee Gold Mine, United States of America
• Hideout, Ukraine
• Hierve el Agua, México
• Hilehvar Buried Village, Iran
• Hill Annex Mine, United States of America
• Himalaya Tourmaline Mine, United States of America
• Himmelfahrt Fundgrube, Germany
• Himmelsbergstollen, Germany
• Himmlisch Heer, Germany
• Hinagdanan Cave, The Philippines
• Hindang Cave and Wild Monkeys, The Philippines
• Hipasam Iron Mine, Argentina
• Cave of Hira, Saudi Arabia
• Hiraodai Nature Observation Center, Japan
• Fischbach, Germany
• Morski tunel Hitlerove oči, Croatia
• Hito-ana, Japan
• Hitonhauta, Finland
• Vyvieračka Hlbokô, Slovakia
• Důl Hlubina, Czech Republic
• Banský Skanzen v Hnilčíku, Slovakia
• Động Hoa Cương, Vietnam
• Động Hoa Tiên, Vietnam
• Hobbiton, New Zealand
• Schaubergwerk Hochfeld, Austria
• Hochkarschacht, Austria
• Hocking Hills State Park, United States of America
• Hodge Close, Great Britain
• Hang Hồ Động Tiên, Vietnam
• Hodruša Hámre, Slovakia
• Atlantikwall-Museum Hoek van Holland, Netherlands
• Höllentalklamm, Germany
• Hölloch, Switzerland
• Höhlenkundliches Museum, Germany
• Schaubergwerk Hofergraben, Austria
• Hoffnungsstollen Todtmoos, Germany
• Högberget Cave, Finland
• Hohenfels-Essinger Eishöhlen, Germany
• Magnesitstollen Hohentauern, Austria
• Hohlenstein, Germany
• Hohlensteinhöhle, Austria
• Hohler Fels, Germany
• Hohler Stein bei Schambach, Germany
• Hohler Stein, Germany
• Hohllay, Luxembourg
• Tham Hoi, Laos
• Hole N" The Rock, United States of America
• Hole in the Rock, New Zealand
• Hole-in-the-Wall, South Africa
• Holkovsky Monastery, Russia
• Holkrans at Golden Gate, South Africa
• Holkrans at Meiringskloof, South Africa
• Hollenkammer, Germany
• Hollombuwa Sthreepura Cave Temple, Sri Lanka
• Holy Crystal Cave, The Philippines
• Schloßberghöhlen, Germany
• Homestake Mine, United States of America
• Homestead Crater, United States of America
• Homosassa Springs, United States of America
• Honey Branch Cave, United States of America
• Honeycomb Cave, New Zealand
• Honeycomb Cave, Australia
• Honi HaMe'agel, Israel
• Honister Slate Mine, Great Britain
• Hopemore Mine, United States of America
• Hopewell Colliery, Great Britain
• Hoq Cave, Yemen
• Horayama, Japan
• Horma Kanyonu, Turkey
• Horne Lake Caves, Canada
• Hornkullens gruvor, Sweden
• Cueva de Hornos de la Peña, Spain
• Grand Hornu, Belgium
• Horseshoe Bend, United States of America
• Horvatove Stube, Croatia
• Hoshino-no ana, Japan
• Hotel Jalta Bunker Museum, Czech Republic
• The Secret Rooms of Hotel Jama, Slovenia
• Hotel Sassi Di Matera Diffuso, Italy
• Peștera Hoților, Romania
• Grottes des 1001 Nuits, Belgium
• Hou'er Sinkhole, China
• La Hougue Bie, Great Britain
• Gorge de Hourat, France
• House on Fire, United States of America
• House of Rock, Samoa
• Downtown Houston Tunnel System, United States of America
• Monkey Mine Museum, China
• Hoverbergsgrottan, Sweden
• Höversbygrottan, Sweden
• Howard Springs, Australia
• Howe Caverns, United States of America
• How Stean Gorge, Great Britain
• Hrad Houska, Czech Republic
• Hranická propast, Czech Republic
• Hrazdan Gorge, Armenia
• Hrustovačka pećina, Bosnia and Herzegovina
• Htan San Cave, Myanmar
• Gruta de Huagapo, Perú
• Huangchuan Three Gorges, China
• Huangdi Dong - Emperor's Cave, China
• Huanglong Dong, China
• Huanglong, China
• Huánglóng dòng, China
• Huangzhu Dong, China
• Huashan Quarries, China
• Huayan Temple, China
• Huayangdong, China
• Hubbard's Cave, United States of America
• Hubertuskapelle, Germany
• Peştera Huda lui Papară, Romania
• Huda Luknja, Slovenia
• Besucherbergwerk Grube "Hühn", Germany
• Hülbener Tropfsteinhöhle, Germany
• Huelgoat, France
• Cueva Huerta, Spain
• Schaubergwerk Hüttenberg, Austria
• Hufangalupe, Tonga
• Hugh's Dale Waterfall, Australia
• Grotte des Huguenots, France
• Huliba Grot, Aruba
• Huligemmana Kolla, India
• Hulimev Cave Temple, India
• Hull Rust Mine, United States of America
• 'Ana Hulu, Tonga
• Sima Humboldt, Venezuela
• Humphrey Kynaston's Cave, Great Britain
• Hundalm Eis- und Tropfsteinhöhle, Austria
• Cueva del Hundidero, Spain
• Hundraðmannahellir, Iceland
• Hungerbrunnen, Germany
• Dong Huong Tich, Vietnam
• Tham Hup Pa Tat, Thailand
• Dělostřelecká Tvrz Hůrka, Czech Republic
• Hurricane River Cave, United States of America
• Mines de Hussigny-Godbrange, France
• Husitské muzeum, Czech Republic
• Huto and Kamarband Cave, Iran
• Sources de l'Huveaune, France
• Hwaam Gul, South Korea
• Hwalok Cave, South Korea
• Hwanggeum Dong, China
• Hwanseon Gul, South Korea
• Hyeopjae Gul - Ssangyong Gul, South Korea
• Iagodinska Peštera, Bulgaria
• Peştera Ialomita, Romania
• Bergbaumuseum Ibbenbüren, Germany
• Iberger Tropfsteinhöhle, Germany
• Ice Cave and Bandera Volcano, United States of America
• Ice Age Glacial Exhibit, United States of America
• Ichetucknee Spring, United States of America
• Għar Id-Duhhan, Malta
• Idagrotte, Germany
• Idaho's Mammoth Cave, United States of America
• Idaion Antron, Greece
• Ida Shaft Headframe, Japan
• Idikundu, Sri Lanka
• Instituto Geológico y Minero Español, Spain
• Ignateva Pestera, Russia
• Gruta da Igrejinha, Brazil
• Iho-Eleru, Nigeria
• Cenote Ik Kil, México
• Ikuno Silver Mine, Japan
• Ikura-do, Japan
• Għar il-Kbir, Malta
• il-Barri Restaurant, Malta
• Le Cisterne ed il Palombaro dell’Hotel Il Belvedere, Italy
• Bunker Ilbenstadt, Germany
• Ilgarini Mağarası, Turkey
• Spilia Illithias - Cave of Ilithias, Greece
• La Grotte (Illetas Club Playa), Spain
• Illinois Caverns, United States of America
• Il-Maqluba, Malta
• Ilsenhöhle, Germany
• La Mine Image, France
• Imi n’Ifri, Morocco
• Imperial Cave, Australia
• Bergbauerlebniswelt Imsbach, Germany
• İnatlı Mağarası, Turkey
• Inanke Cave, Zimbabwe
• Inazumi suichu shonyudo, Japan
• Puente del Inca, Argentina
• Inca Cueva, Argentina
• İnceğiz Mağaraları, Turkey
• Incirli Cave, Cyprus
• İncirliin Mağarası, Turkey
• Independence Mine, United States of America
• Museum of Independence, Bangladesh
• Indian Caverns, United States of America
• Indian Cave, Antigua & Barbuda
• Indiana Caverns, United States of America
• Indianapolis City Market Catacombs, United States of America
• Indian Echo Caverns, United States of America
• Indian Cave State Park, United States of America
• Indian Trail Caverns, United States of America
• Indian Cave Village, United States of America
• Cuevas del Indio, Cuba
• Cueva del Indio, Puerto Rico
• Boca do Inferno, Portugal
• Cueva del Infierno, Puerto Rico
• 3rd Infiltration Tunnel, South Korea
• 4th Infiltration Tunnel, South Korea
• 2nd Infiltration Tunnel, South Korea
• Ingleborough Cave, Great Britain
• Injun Joe's Cave, United States of America
• Inkerman Cave Monastery, Russia
• Qaura - Inland Sea, Malta
• Inner Space Cavern, United States of America
• Innocent Railway Tunnel, Great Britain
• Inscrições Rupestres, Brazil
• Institutul de Speologie "Emil Racoviţă", Romania
• Insuyu Mağarasın, Turkey
• Intermittent Spring, United States of America
• Interstate Caves, United States of America
• Limni Ioanninon - Lake Pamvotis, Greece
• Ioki Cave, Japan
• Poarta Lui Johele, Romania
• Ipapanti Monastery, Greece
• Ipswich Caves, Jamaica
• Irimizu shonyudo, Japan
• Iriyuji-Gama Cave, Japan
• Ironbridge Gorge Museum, Great Britain
• Iron Mountain Iron Mine, United States of America
• Ishigaki Do, Japan
• Grotte Is Janas, Italy
• Voragine di Ispinigoli, Italy
• Istállós-kői-barlang, Hungary
• Isteiner Klotz, Germany
• Les Grottes Isturitz et Oxocelhaya, France
• Peştera Isverna, Romania
• Grotte Is Zuddas, Italy
• Itaimbezinho Canyon, Brazil
• Itäkeskuksen Uimahalli, Finland
• Ittin Cave, Oman
• Ivanovo Rock Churches, Bulgaria
• Iwami Ginzan, Japan
• Iwamuro Kannon, Japan
• Iwaya shōnyūdō, Japan
• Iwaya Kannon Cave, Japan
• Iwaya Kannon, Japan
• Iwayayama Cave, Japan
• Peștera Izbândiș, Romania
• Izumizaki Cave Tomb, Japan
• Izuru shonyudo, Japan
• Jaana Dragon Cave, Japan
• Jacks Blowhole, New Zealand
• Jacob's Well, United States of America
• Jacob's Cave, United States of America
• Jagersfontein Mine, South Africa
• Jameos del Agua, Spain
• James Bond Rock, Thailand
• Štola Jana Evangelisty, Czech Republic
• Janeh Cave, Japan
• Caverna Janelão, Brazil
• Jankovich-barlang, Hungary
• Jánošíkove diery, Slovakia
• Cenote Jardin del Eden, México
• Jarnan Cave, Oman
• Podziemia Jarosławskie, Poland
• Jasana Cave, Iraq
• Jaskinia Jasna koło Smolenia, Poland
• Jasovska Jaskyna, Slovakia
• Jasujeong, South Korea
• Goa Jatijajar, Indonesia
• Grottes troglodytes de la Jaubernie, France
• Javoříčské jeskyně, Czech Republic
• Mina de la Jayona, Spain
• Musée de la mine Jean-Marie Somet, France
• Jeffrey's Hole, Bermuda
• Magharet Jeita, Lebanon
• Mina do Jeje, Brazil
• Jelovačka Pećina, Montenegro
• Jelovičko vrelo, Serbia
• Jemez Soda Dam, United States of America
• Jeongbang Waterfall, South Korea
• Goa Jepang Klungkung, Indonesia
• Grottes du Pic du Jer, France
• Jersey Cave, Australia
• Ye Olde Trip to Jerusalem, Great Britain
• Gruta dos Jesuítas, Brazil
• La Cueva del tío Jesús, Spain
• Jewel Cave, United States of America
• Margaret River Caves - Jewel Cave, Australia
• Jezuïetenberg, Netherlands
• Jiguandong, China
• Jihlavské podzemí, Czech Republic
• Jillabenan Cave, Australia
• Jing Dong Da Rong Dong, China
• Jingemia Cave, Australia
• Jiulongdong, China
• Jiutian Dong, China
• Yiyuan Jiutian Cave, China
• Jiuxiang Dong, China
• Jiuxiao Biyundong, China
• Jizhou Dong, China
• Jobitzinaj Cave, Guatemala
• Štola Johannes, Czech Republic
• Grottan Johannes Kammare, Sweden
• Johannesbachklamm, Austria
• Johannisfelsen, Germany
• Goa Jomblang, Indonesia
• Jomon shonyudo, Japan
• Grottes de Jonas, France
• Jordan Creek Underground Tours, United States of America
• Jorf Khettaras, Morocco
• Josefov Podzemi, Czech Republic
• Josef Stalin's Underground Printing House Museum, Georgia
• Musée de la Mine à Joseph-Else, France
• Les Journées de la Rose, France
• Cueva Juan Nieves, Puerto Rico
• Jubilee Cave, Australia
• Internationales Fledermaus-Museum Julianenhof, Germany
• Cavernas de Jumandi, Ecuador
• Junction Cave, Australia
• Jungang Underground Shopping Center, South Korea
• Jungfernhöhle, Germany
• Juniper Springs, United States of America
• Junkundar Coal Mine, India
• Jurnet's Bar, Great Britain
• Grutas de Juxtlahuaca, México
• Jvari Pass Travertine, Georgia
• Kaaiman's Grotto, South Africa
• Laguna de Kaan Luum, México
• Kaaterskill Falls, United States of America
• Kachargadh Caves, India
• Termálny Prameň Kaďa, Slovakia
• Magharet Qadisha, Lebanon
• Cave Church Kadjenica, Serbia
• Jaskinie na Kadzielni, Poland
• Kælderhalsen, Denmark
• Bergbaumuseum und Besucherbergwerk Käpfnach, Switzerland
• Eesti Kaevandusmuusem, Estonia
• Kaew Cave, Thailand
• Tham Kaew Komol, Thailand
• Kåfjord Kopperverk, Norway
• Kagekiyo-do, Japan
• Kaghu Waterfall, Georgia
• Kahlensteinhöhle, Germany
• Former Japanese Navy Underground Headquarters, Japan
• Kailash Gufa, India
• Kain Hitam - The Painted Cave, Malaysia
• Kaiserklamm, Austria
• Kaiserliche Schatzkammer, Austria
• Kaiser-Max-Grotte, Austria
• Unterirdische Gänge Kaiserslautern, Germany
• Feste Kaiser Wilhelm II, France
• Ana Kai Tangata, Chile
• Kaiyuan Cave, China
• Ana Kakenga, Chile
• Kaklik Mağarası, Turkey
• Gorges de Kakuetta, France
• Kakushöhle, Germany
• Kalabera Cave, Northern Mariana Islands
• Crkva „Sv. Bogorodica“ Kališta, North Macedonia
• Goa Kalisuci, Indonesia
• Kalkstensgrottor, Sweden
• Ausweichsitz Nordrhein-Westfalen, Germany
• Kalladanthy Natural Cave, India
• Hohler Stein, Germany
• Emmi Cheese Cave Kaltbach, Switzerland
• Karstlehrpfad Kaltbrunnental-Brislachallmet, Switzerland
• Kamarai Gorge, Greece
• Spilaio Kamares - Cave Kamaron - Kamares Cave, Greece
• Caverna Kambá Hópo, Paraguay
• Kameiwa Cave, Japan
• Kamenice Hřensko, Czech Republic
• Kamieńczyk Gorge, Poland
• Kammerbacher Höhle, Germany
• Haus des Bergmanns, Germany
• Besucherbergwerk Kamsdorf, Germany
• Cizinecký vstup do kanalizace, Czech Republic
• Kana Raja's Cave, Bangladesh
• Kanarra Creek Gorge, United States of America
• Kanba-no Oni-no ana, Japan
• Las Cuevas de K'an Ba, Guatemala
• Kandovan, Iran
• Kaneana Cave, United States of America
• Kanehon Quarry, Japan
• Kanheri Caves, India
• Kaniwhaniwha Caves, New Zealand
• Cenote Kankirixche, México
• Kanlıdivane, Turkey
• Kanmon Kaikyo Tunnel, Japan
• Grotten Van Kanne, Belgium
• Kannon Dokutsu, Japan
• Kanowna Belle Goldmines, Australia
• Kansas Underground Salt Museum, United States of America
• Kantakuzen’s Catacomb, Ukraine
• Mogharet el Kantara, Egypt
• Kantun Chi Caves, México
• Kanze Limestone Cave, Japan
• Tham Kao Rao, Laos
• Bunker am Kap Arkona, Germany
• Kapilikaya Rock Tomb, Turkey
• Kap-Kutan Cave, Turkmenistan
• Kåppasjåkkagrottorna, Sweden
• Kapsia Cave, Greece
• Kaptensspelet, Sweden
• Kapucínská krypta, Czech Republic
• Kapuzinergruft, Austria
• Karaca Mağarası, Turkey
• Karaftu Cave, Iran
• Karain Mağarası, Turkey
• Karaulnaya Cave, Russia
• Karavanserai Bakery, Georgia
• Karla Caves, India
• Karlamanska Cave, Russia
• Karl-May-Höhle, Germany
• Karlyuk Caves, Turkmenistan
• Grotta della Gavetta e Grotta del Pilone, Italy
• Grutas Karmidas, México
• Karstkundlicher Wanderweg Laichingen, Germany
• Kartchner Caverns State Park, United States of America
• Karvės Ola, Lithuania
• Brasserie Kazematten, Belgium
• Kastania Cave, Greece
• Spilaio Kastritza - Kastritsa Cave, Greece
• Katafiki Cave, Greece
• Spilia Katafygi, Greece
• Ghar Katalehkhor, Iran
• Kåtavikens grottstig, Sweden
• Katavothres - Katabothres, Greece
• Katavothres, Greece
• Katerinska jeskyne, Czech Republic
• Katerloch, Austria
• Katflaap Catacombs, Molvanîa
• Kathu Mining Museum, Thailand
• Katla Ice Cave, Iceland
• Tombs of the Kings, Cyprus
• Katouche Cave, Anguilla
• Katpatuka Cave Hotel, Turkey
• Kaumana Cave, United States of America
• Kaunos Kral Mezarları, Turkey
• Kaupo Ala, Latvia
• Cuevas de Kavac, Venezuela
• Kawachi Fuketsu, Japan
• Kaw Gon Cave, Myanmar
• Kawiti Glowworm Caves, New Zealand
• Kaw Ka Thaung Cave, Myanmar
• Kayadem Cave Hotel, Turkey
• Musée National des Mines, Luxembourg
• Kaymaklý Yeraltı Şehri, Turkey
• Kazanluk Tomb, Bulgaria
• Brouwerij De Kazematten, Belgium
• Kazumura Cave, United States of America
• Keerimalai Sacred Water Spring, Sri Lanka
• Trypas Kefalas - Cave of Kefala, Greece
• Kefalari, Greece
• Kefalari Spring, Greece
• Gua Kelam, Malaysia
• Gua Kelam 2, Malaysia
• Gua Kelawar, Malaysia
• Kelebek Hotel, Turkey
• Kelly Mine, Great Britain
• Kelly Hill Caves, Australia
• Keloğlan Mağarası, Turkey
• Cave of Kelpius, United States of America
• Kelvedon Hatch Secret Nuclear Bunker, Great Britain
• Command Bunker Kemmel, Belgium
• Kennecott Mine, United States of America
• Kennedy Mine, United States of America
• Kents Cavern, Great Britain
• Kentucky Caverns, United States of America
• Kentucky Coal Mining Museum, United States of America
• Caves of Keshcorran, Ireland
• Rainbow Cave, Israel
• Kesselfallklamm, Austria
• Kessler Kellerführungen, Germany
• Kesslerloch, Switzerland
• Keswick Mining Museum, Great Britain
• Keterisi Mineral Vaucluse, Georgia
• Magharet Kfar Him, Lebanon
• Khadr Afrar Cave, Oman
• Khadzhokhskaya tesnina, Russia
• Khambhalida Buddhist Caves, India
• Tham Khamin, Thailand
• Khandagiri Cave, India
• Caves of Khandepar, India
• Khangkhui Mangsor, India
• Tham Bin Cave, Thailand
• Khao Chang Hai Cave, Thailand
• Tham Khao Khun Krathing, Thailand
• Tham Khao Kop, Thailand
• Tham Khao Kriep Ngoen, Thailand
• Tham Khao Luang, Thailand
• Tham Khao Mai Khew, Thailand
• Khao Nam Khang Historical Tunnel, Thailand
• Tham Khao Ngoen, Thailand
• Tham Khao No, Thailand
• Khao Tham Phra, Thailand
• Khapra Kodiya Caves, India
• Khareba Winery, Georgia
• Khayon Cave, Myanmar
• Khewra Salt Mines, Pakistan
• Tham Khlang, Thailand
• Caves of Khnatsakh, Armenia
• Kh'ndzoresk, Armenia
• Grutas do Khodzue, Mozambique
• Khomuli Cave, Georgia
• Wat Khuha Phimuk, Thailand
• Tham Khuha Sawan, Thailand
• Kickapoo Cavern State Park, United States of America
• Kickapoo Indian Caverns, United States of America
• Muuseum Kiek in de Kök, Estonia
• Kiev Pechersk Lavra, Ukraine
• Kigan Yusenkyo, Japan
• Kiik-Koba, Russia
• Kiinen Gongen, Japan
• Widerstandsnest 67 HL, Netherlands
• Besucherbergwerk Kilianstollen, Germany
• Killhope Lead Mining Museum, Great Britain
• Killing Caves, Cambodia
• Kimberley Mine - Big Hole, South Africa
• Kimberley Underground Mining Railway, Canada
• Động Kim Quy, Vietnam
• Kin-nisshu-do, Japan
• Air Defense Operations Center Kindsbach, Germany
• King's Cave, Great Britain
• King Arthur's Labyrinth, Great Britain
• King Arthur's Cave, Great Britain
• King Edward Mine, Great Britain
• King George V Cave, Australia
• König-Otto-Tropfsteinhöhle, Germany
• King Solomon Cave, Australia
• King Solomon's Mines, Israel
• Gold Cave Café and Bonsai Garden, Japan
• Kinver Edge Rock Houses, Great Britain
• Kipina Monastery, Greece
• Kirkilai Lakes and Observation Tower, Lithuania
• Kırmızı Su, Turkey
• Kirnitzschklamm, Germany
• LKAB Visitor Centre, Sweden
• Kish Underground City, Iran
• Goa Kiskendo Jatimulyo, Indonesia
• Goa Kiskendo Trayu, Indonesia
• Kitch-iti-kipi, United States of America
• Kitley Show Cave, Great Britain
• Kittelsthaler Tropfsteinhöhle, Germany
• Historisches Schmucksteinbergwerk "Kittenrain", Germany
• Kitum Cave, Kenya
• Kitzlochklamm, Austria
• Kiwengwa Caves, Tanzania
• Kiyomigaoka Limestone Cave, Japan
• Kiyotsu-kyō, Japan
• Kizil Caves, China
• Klackbergs Gruvfält, Sweden
• Kläfferquelle, Austria
• Klæmintsgjógv, Faroe Islands
• Bergbaumuseum Klagenfurt, Austria
• Kláštorská Roklina, Slovakia
• Klatovské katakomby, Czech Republic
• Klausenhöhle, Germany
• Kleine Berlin, Italy
• Besucherbergwerk Kleinenbremen, Germany
• Bergbaumuseum "Kleiner Johannes", Germany
• Gletschergrotte Klein Matterhorn, Switzerland
• Kleinsteinhöhle, Germany
• Kopalnia Uranu Kletno, Poland
• Kleva gruva, Sweden
• Klobasja Jama, Slovenia
• Klodawa Salt Mine, Poland
• Podziemna Trasa Turystyczna 1000-Lecia Panstwa Polskiego w Klodzku, Poland
• Twierdza Klodzka, Poland
• Klösterl, Germany
• Klosterstollen Barsinghausen, Germany
• Klusfelsen, Germany
• Kluterthöhle, Germany
• Knaben Gruvemuseum, Norway
• Knadel Cave Tour, Morocco
• Knalla gruvmuseum, Sweden
• Lausitzer Bergbaumuseum Knappenrode, Germany
• Schachtanlage Knesebeck, Germany
• Knife River Coal Mine & Bucket Site, United States of America
• Kőbányai pincerendszer, Hungary
• Kristallhöhle Kobelwald, Switzerland
• Legaga la ga Kobokwe, Botswana
• Koboriya shonyudo, Japan
• Kocaín Mağarası, Turkey
• Besucherbergwerk in Bad Friedrichshall-Kochendorf, Germany
• Kocherursprung, Germany
• Kalkbergwerk am Königsberg, Germany
• Grube Marie in der Kohlbach, Germany
• Kohlerhöhle, Austria
• Kohtla-Järve Põlevkivimuuseum, Estonia
• Kojima Kurago, Japan
• Kokopelli's Cave, United States of America
• Kolar Gold Fields, India
• Kolbinger Höhle, Germany
• Kolowrathhöhle, Austria
• Komakado Fuketsu, Japan
• Komati Gorge, South Africa
• Kom es-Shouqafa, Egypt
• Komori kutsu, Japan
• Kompong Trach Cave, Cambodia
• Kondhane Buddhist Caves, India
• Konĕpruské jeskyně, Czech Republic
• Tham Kong Lor, Laos
• Norsk Bergverksmuseum Kongsberg, Norway
• Kongshan Baiyun Cave, China
• Konispol Cave, Albania
• Konnerud Gruver, Norway
• Schacht Konrad, Germany
• Konungastollen, Sweden
• Kooringa Cave, Australia
• Natural Cave Koovapara, India
• Podziemne Muzeum "Kopalnia Zlota" w Zlotym Stoku, Poland
• Stora Kopparberget, Sweden
• Koppartorp, Sweden
• Koppenbrüllerhöhle, Austria
• Kamara tou Koraka Natural Bridge, Cyprus
• Korallgrottan, Sweden
• Korkinsk Coal Mine, Russia
• Fontana s Kornjačama, Croatia
• Museum "Rock" Korosten, Ukraine
• Korsanini Mağarası, Turkey
• Korykio Andro - Corycian Cave, Greece
• Köşekbükü Mağarası, Turkey
• Slovenské Technické Múzeum, Slovakia
• Kostanjevica Jama, Slovenia
• Jeskyně Kostelík, Czech Republic
• Kottukal Cave Temple, India
• Kounoubwa Cave, Haiti
• Kourtaliotiko Gorge, Greece
• Spilia Koutouki - Koutouki Cave, Greece
• Kovači, Bosnia and Herzegovina
• Historický důl Kovárna, Czech Republic
• Skansen Górnictwa Kowarskiego, Poland
• Sztolnie Kowary, Poland
• Kow Ata Underground Lake, Turkmenistan
• Peshtera Kozarnika, Bulgaria
• Slap Kozjak, Slovenia
• Wat Tham Krabok, Thailand
• U Krále Brabantského, Czech Republic
• Kraljičina Špilja, Croatia
• Králova jeskynĕ, Czech Republic
• Vinárna U Královny Elišky, Czech Republic
• Rovi pod starim Kranjem, Slovenia
• Krapina Cave, Croatia
• Tham Krasae, Thailand
• Tham Krasaeng, Thailand
• Krasnaja pestera, Russia
• Krasnohorska Jaskyna, Slovakia
• Krasny Klutch Spring, Russia
• Kraushöhle, Austria
• Kreidelucke, Austria
• Goa Kreo, Indonesia
• Karstlehrpfad Krippenstein, Austria
• Kristallgänge, Germany
• Kristalnaja pestera, Ukraine
• Kristal Teras, Turkey
• Kristinebergs gruva, Sweden
• Krizna Jama, Slovenia
• Nacionalni park Krka, Croatia
• Krka Spring, Croatia
• Kromdraai Gold Mine, South Africa
• Krompirjeva Jama, Slovenia
• Kronborg Slot, Denmark
• Castello di Mezzocorona, Italy
• Höhlenburg Kropfenstein, Switzerland
• Graphitbergwerk Kropfmühl, Germany
• Jaskinia Krowia, Poland
• Krška jama - izvir Krke, Slovenia
• Krupajsko Vrelo, Serbia
• Izvir Krupe, Slovenia
• Krushuna, Bulgaria
• Potkop Krušica, Croatia
• Kryt 10 - Z, Czech Republic
• Kryt Denis, Czech Republic
• Prahistoryczne Kopalnie Krzemienia w Krzemionkach, Poland
• Kuang Si Falls, Laos
• Kubacher Kristallhöhle, Germany
• Kuda Mandad Caves, India
• Kuhfluchtwasserfälle, Germany
• Fiery Caves of Kuhi-Malik, Tajikistan
• Kuhstall, Germany
• Kula Kai Caverns, United States of America
• Eshab-ı Kehf Kulliye, Turkey
• Kulturbunker Barbarastollen, Germany
• 'Ana Kuma, Tonga
• Manza Onsen Kumashiro Cave, Japan
• Kumaso ana, Japan
• Kumaya Cave, Japan
• Kumganggul, South Korea
• Kuna Cave, United States of America
• Kundler Klamm, Austria
• Kundum Cave, Bangladesh
• Kungur ledenica pestera, Russia
• Kunming Natural History Museum of Zoology, China
• Historischer Kunstbunker, Germany
• Izvor Kupe, Croatia
• Kupferberg Museum, Germany
• Bergbau-Museum Kupferberg, Germany
• Schaubergwerk Kupferplatte, Austria
• Kuragala Cave Temple, Sri Lanka
• Kurasawa Shonyudo, Japan
• Kurjey Lhakhang, Bhutan
• Kurobe Gorge, Japan
• Hrádek a důl Osel Kutná Hora, Czech Republic
• Kutumsar Gufa, India
• Kuumbi Cave, Tanzania
• Kuza Cave, Tanzania
• Kverkfjöll, Iceland
• Kvernufoss, Iceland
• Kyat Khayon Cave Monastery, Myanmar
• Kyrk Gyz Cave, Turkmenistan
• Kyusen-do, Japan
• Kyzyl-Yar Cave, Russia
• Laas Gaal, Somalia
• La'auolola Caves, Samoa
• Grotta di Labante, Italy
• Grotte de Labastide, France
• Gruta La Batata, Cuba
• Grotte de Labeil, France
• Budavári Labirinthus, Hungary
• Labirinto di Porsenna, Italy
• Riv. Souterraine de Labouiche, France
• Labyrinth pod Zelným trhem, Czech Republic
• Labyrinthe, Luxembourg
• Caves and Labyrinths, Ukraine
• Lac Souterrain St-Léonard, Switzerland
• Mina De Oro La Carolina, Argentina
• Grotte de Lacave, France
• Restaurant La Cave, France
• La Caverna, Honduras
• La Caverne, Netherlands
• Laguna Lachua, Guatemala
• Lackawanna Coal Mine Tour, United States of America
• La Claustra Hotel, Switzerland
• La Coupole, France
• Mines d'argent de La Croix-aux-Mines, France
• La Cuevita, Costa Rica
• Bunker Ladeburg, Germany
• Lærdalstunnelen, Norway
• Caverne Laflèche Caves, Canada
• La Fuente, Panama
• Lagang Cave, Malaysia
• Gruta da Lage Branca, Brazil
• Gruta do Lago Azul, Brazil
• Grotte del Lago Grande, Italy
• LagOmar, Spain
• Lago di Telese, Italy
• La Grotte de Glace La Grave La Meije, France
• La Gruta, Panama
• La Gruta, México
• Laguna Cave, Belize
• Laichinger Tiefenhöhle, Germany
• Lajedo de Soledade, Brazil
• Margaret River Caves - Lake Cave, Australia
• Lake Shasta Caverns, United States of America
• Lalibela, Ethiopia
• Musée de la Mine à La Machine, France
• Lama La Vita, Italy
• Grotta Lamalunga, Italy
• Grottes de Lamberta, Switzerland
• Lamgao Buddhist Caves, India
• Lammeröfen, Austria
• Grotta dei Lamponi, Italy
• Lamprechtsofen, Austria
• Gruta da Lancinha, Brazil
• Hornické muzeum OKD Landek, Czech Republic
• Landgrafenschlucht, Germany
• Landmannahellir, Iceland
• Batteri Landsort, Sweden
• Lang's Cave, Malaysia
• Langbans Mines, Sweden
• Felslabyrinth Langenhennersdorf, Germany
• Höhlenwohnungen in Langenstein, Germany
• Kupferschieferbergwerk Lange Wand, Germany
• Langjökull Glacier Grotto, Iceland
• Gorges de la Langouette, France
• NOAH Langøya, Norway
• Lanner Gorge, South Africa
• Lanquín Caves, Guatemala
• Lanson, France
• Xixia Laojun Cave, China
• Chongqing Laojun Cave, China
• Chongqing Laolong Cave, China
• Lao Mei, China
• Virgem da Lapa, Brazil
• Gruta Lapa Doce, Brazil
• Gruta da Lapa Grande, Brazil
• Gruta da Lapa Nova, Brazil
• Gruta do Lapão, Brazil
• Gruta do Lapão, Brazil
• Gruta Lapa Velha, Brazil
• Cueva de La Peña, Spain
• Gruta da Lapinha, Brazil
• Les Lapidiales, France
• Għar Lapsi, Malta
• Sentier karstique de La Romieu-Gazaupouy, France
• Fort Troglodytique de La Roque Gageac, France
• Nacedero del Larráun, Spain
• Historische Kupferzeche am Larzenbach, Austria
• La Salina, Spain
• Lascaris War Rooms, Malta
• Grotte de Lascaux, France
• Las Cuevas, Spain
• Los Callejones de Las Majadas, Spain
• Cueva de las Manos, Argentina
• Las Médulas, Spain
• Cueva de Las Palomas, Spain
• Balneario Las Pozas, Guatemala
• Lasse-Maja Grottan, Sweden
• Last Chance Mining Museum, United States of America
• Last Chance Mine, United States of America
• Lastiver Cave, Armenia
• Grotte de Lastournelle, France
• Cueva de la Lastrilla, Spain
• Caverne des Lataniers, France
• La Thuile Mine, Italy
• Latomie, Italy
• Abri de Laugerie-Haute, France
• Parque Minero de La Unión, Spain
• Launois Père & Fils, France
• Laurel Caverns, United States of America
• Cavernas de Laurel, Perú
• Laurent-Perrier, France
• Grotte des Lauriers, France
• Historisches Silberbergwerk Lautenthals Glück, Germany
• Lava Beds Caves, United States of America
• Lavakeller, Germany
• La Valette Underground Military Museum, Great Britain
• Lava River Cave - Newberry National Volcanic Monument, United States of America
• La salle de La Verna, France
• Grotte de Laveuses, France
• Tham Lawa, Thailand
• Goa Lawah, Indonesia
• Goa Lawa Purbalingga, Indonesia
• Laxey Wheel, Great Britain
• Layser Cave, United States of America
• Laywell, Great Britain
• La Zaplaz, Romania
• Grotte du Lazaret, France
• Leamington Caves, Bermuda
• Lebanon Silver Mine, United States of America
• Gua Lebar, Indonesia
• Mines de sel de Bex, Switzerland
• Le Caveau, France
• Lechuguilla Cave, United States of America
• Cueva de la Lechuzas, Perú
• Ledena pećina, Montenegro
• Ledena Pećina, Serbia
• Ledenika, Bulgaria
• Ledge View Nature Center, United States of America
• Ledová jeskynĕ, Czech Republic
• Canadian Energy Museum, Canada
• Lee Ice House, Great Britain
• Schieferpark Lehesten, Germany
• Lehman Caves, United States of America
• Leichtweißhöhle, Germany
• Leiðarendi, Iceland
• Ffynnon Leinw, Great Britain
• Musée de la Mine Le Molay Littry, France
• Volcan de Lemptégy, France
• Lenagala Rajamaha Vihara, Sri Lanka
• Eisenerzgrube Lengede-Broistedt, Germany
• Kalkwerk Lengefeld, Germany
• Grube Lengenbach, Switzerland
• Lennard River Gorge, Australia
• Lenore Caves, United States of America
• Lenyadri Caves, India
• Schaubergwerk Leogang, Austria
• Grube Leonie, Germany
• Lepenitza Cave, Bulgaria
• Le Prince Noir, France
• Lerna, Greece
• La Grotte de Glace Les Arcs, France
• La Grotte de Glace Les 2 Alpes, France
• Musée National de Préhistoire, France
• Les Maisons de Cappadoce, Turkey
• Les Terrasses d'Uchisar, Turkey
• Grotta di S. Angelo di Lettomanoppello, Italy
• Leutasch-Klamm Wasserfallsteig, Austria
• Levant Mine, Great Britain
• Leveäniemigruvan, Sweden
• Leviathan Lava Tube, Kenya
• Levon’s Divine Underground, Armenia
• Centre Historique Minier Lewarde, France
• Lewis and Clark Caverns State Park, United States of America
• Lewis Merthyr Colliery, Great Britain
• Pertouse de Leytro, Switzerland
• Li'angahuo 'a Maui, Tonga
• Liang Bua Cave, Indonesia
• Liánhuā dòng, China
• Lianzhou Underground River Scenic Area, China
• Liar's Cave, Bulgaria
• Musée de la Libération de Paris, France
• Lībiešu upuralas, Latvia
• Liboriusklause, Germany
• Lice Ashâb-ı Kehf Mağarası, Turkey
• Trau auf Gott Erbstolln Lichtenberg, Germany
• Lidbergsgrottorna, Sweden
• Carrières de la Lie, France
• Liechtensteinklamm, Austria
• Lighthouse Cave, Bahamas
• Lileiko Mati, Greece
• Peştera Liliecilor, Romania
• Rimstone Pools of the Lillach River, Germany
• Lima Catacombs, Perú
• Limestone Caves, Australia
• Gruta do Limoeiro, Brazil
• Maison de l'Or en Limousin, France
• Grotte de Limousis, France
• Lincoln Caverns, United States of America
• Grotte de Lindéralique, New Caledonia
• Linggu Dong, China
• Lingqi Karst Cave, China
• Ling Shan Cave, China
• Lingyan Cave, China
• Yiyuan Lingzhi Cave, China
• Linkenboldhöhle, Germany
• Linno Gu, Myanmar
• Lintvern, Slovenia
• Linville Caverns, United States of America
• Lion's Cave, China
• Lion Salt Works, Great Britain
• Lipci Cave, Montenegro
• Liphofung Rock Shelter, Lesotho
• Lippoldshöhle, Germany
• Lipska Pecina, Montenegro
• Podzemie pod vežami, Slovakia
• Lisboa Roman Galleries, Portugal
• Source du Lison, France
• Liss Ard, Ireland
• Lithgow State Mine, Australia
• Gruvemuseet på Litlabø, Norway
• Litli Björn - Vörðuhellir, Iceland
• Zámecké sklepení Litomyšl, Czech Republic
• Fort de Litroz, Switzerland
• Little American Mine, United States of America
• Little Huson Cave Park, Canada
• Liuku Show Cave, China
• Musée de la Mine du Livet, France
• LKAB Gruvmuseum, Sweden
• Cueva de Llamazares, Spain
• The Welsh Slate Museum, Great Britain
• Chwarel Hên Llanfair, Great Britain
• Cuevo del Llanos, Spain
• Llechwedd Slate Cavern, Great Britain
• Kanioni i Llëngës, Albania
• Llewelyn's Cave, Great Britain
• Cueva de Llonín, Spain
• Cova Del Llop Marí, Spain
• Cuevas de la Lluera, Spain
• Llywernog Silver-Lead Mine Museum, Great Britain
• Local Cave House, Turkey
• Höhlenburg Loch, Germany
• Burg Loch, Austria
• Lockgruvan, Sweden
• Lockport Cave Raceway Tour, United States of America
• Maison de la Mine à Locmaria-Berrien, France
• Locso-on Cave, The Philippines
• Lóczy barlang, Hungary
• Tham Lod, Thailand
• Lötschberg-Basistunnel, Switzerland
• Löwengrube, Germany
• Loizos Cave, Greece
• Lojzova Jama, Slovenia
• Jaskinia Łokietka, Poland
• Gammelgruva Løkken, Norway
• Špilja Lokvarka, Croatia
• Grutas de Lol-Tún, México
• Lomax Placer Mine, United States of America
• Grotte de Lombrives, France
• London Underground, Great Britain
• Lonetopf, Germany
• Loneversickerung, Germany
• Longgang Tiankeng, China
• Longgong Caves, China
• Longgong Cave, Jiangxi, China
• Longhorn Caverns, United States of America
• Longkong Dong, China
• Longlin Shihai, China
• Long Men Dong, China
• Longmen Grottoes, China
• Longmendong, China
• Longquan Cave, China
• Longshuixia Difeng, China
• Longtan Karst Cave, China
• Long Tunnel Extended Gold Mine, Australia
• Longxian Palace, China
• Longyan Cave, China
• Longyearbreen Grotte, Norway
• Longyou Caves, China
• Loos Koboltgruva, Sweden
• Los Nacimientos, Guatemala
• Cueva de Los Pajaritos, Argentina
• Lost Mine, United States of America
• Lost Caves, Great Britain
• Lost Lake, United States of America
• Lost River Caverns, United States of America
• Lost River Cave and Valley, United States of America
• Lost Sea, United States of America
• Lost World Caverns, United States of America
• The Lost World, New Zealand
• Cueva de Los Verdes, Spain
• Tham Lot Puyu, Thailand
• Lotus Cave, China
• Source de la Loue, France
• Loufang Cave, China
• Loughareema, Ireland
• Sztolni Królowa Luiza, Poland
• Mina subterrânea de Sal-Gema de Loulé, Portugal
• Grotta di Lourdes del Beato Claudio, Italy
• Museu Mineiro do Lousal, Portugal
• Love Bridge, Cyprus
• LowLine, United States of America
• Goa Lowo Trenggalek, Indonesia
• Tham Luang Nang Non, Thailand
• Tham Luang Pha Wiang, Thailand
• Lubang Jepang, Indonesia
• Lublova Torturak, Molvanîa
• Lúčansky Vodopád, Slovakia
• Lucas Cave, Australia
• Lucca City Walls Basement, Italy
• Cueva del Lucero, Puerto Rico
• Museo de La Lucha Obera, México
• Ludi Yan - Reed Flute Cave, China
• Lud’s Church, Great Britain
• Ludvika Gruvmuseum, Sweden
• Besucherbergwerk Grube Ludwig, Germany
• Ludwigshöhle, Germany
• Ludwigsklamm, Germany
• Lügenstein, Germany
• Luegstein Höhle, Germany
• Lugnås Minnesfjäll, Sweden
• Museo Mineralogico Luigi Celleri, Italy
• Museo di Speleologia Luigi Fantini, Italy
• Grotte de la Luire, France
• Lumiang Cave, The Philippines
• Lumingsen Valley Tourist Resort, China
• Gruta Luminosa, Brazil
• Lummelundagrottan, Sweden
• Hang Lùng Khúy, Vietnam
• Luobi Cave, China
• Luojishan Fairy Cave, China
• Luō mèi liánhuā dòng, China
• Hang Luồn, Vietnam
• Museo ng Libingan sa Ilalim ng Lupa, The Philippines
• Lupercale, Italy
• Grotte di Luppa, Italy
• Luray Caverns, United States of America
• Lurgrotte Peggau, Austria
• Lurgrotte Semriach, Austria
• Lusk Cave, Canada
• Grottes de Lustin, Belgium
• Lutetia´s Sewer System, France
• Luzhou Fairy Cave, China
• Luzit Caves, Israel
• Lydford Gorge, Great Britain
• Lydstep Caverns, Great Britain
• Spilaio Aggitis, Greece
• Maarata Cave, Bulgaria
• Maastricht Kazematten, Netherlands
• Maastunnel, Netherlands
• Mabaj Cave, Lebanon
• Macahambus Cave, The Philippines
• Museu Vulcanoespeleológico "Machado Fagundes", Portugal
• Ma'arat HaMachpelah, Israel
• Mackinac Island State Park, United States of America
• Propast Macocha, Czech Republic
• Macraes Mine, New Zealand
• Gua Madai, Malaysia
• La Cave Madame, Mauritius
• Madan Museum of Ore Mining and Mining Industry, Bulgaria
• Grotte de la Madeleine, France
• Abri de la Madeleine, France
• Madison Coal Museum, United States of America
• Grotta della Madonna, Italy
• Madonna della Grotta, Italy
• Santuario della Madonna della Grotta di Bombile, Italy
• Santuario della Madonna della Grotta, Italy
• Chiesa Cripta Madonna della Grotta, Italy
• Madonna della Corona, Italy
• Madonna delle Virtù, Italy
• Chiesa Rupestre della Madonna della Croce, Italy
• Gua Madu, Malaysia
• Tham Mae Lana, Thailand
• Tham Mae Nang Montho, Thailand
• Maeshowe, Great Britain
• Parc Miner del Maestrat, Spain
• Tham Mae Usa, Thailand
• Tham Mae Usu, Thailand
• Bergbaumuseum Maffeischächte, Germany
• Magdalena-Einsiedelei, Switzerland
• Magická Jeskyně, Czech Republic
• Magili, Armenia
• Festungsmuseum Magletsch, Switzerland
• Magnanerie de Bourré, France
• Farmacia del Mago Greguro, Italy
• Magura, Bulgaria
• Magyar Olaj- és Gázipari Múzeum, Hungary
• Mahabalipuram Caves, India
• Mahakali Caves, India
• Maharani Zoo dan Goa, Indonesia
• Mahendra Gupha, China
• Mahendra Guffa, Nepal
• Mahendravadi Cave Temple, India
• Maiji Shan Caves, China
• Mailly Grand Cru, France
• Maimu Cave, Estonia
• Maison Forte, France
• Maison Owl, Japan
• Cueva de la Majahua, México
• Majestic Caverns, United States of America
• Majlis Al-Jin, Oman
• Makauwahi Cave, United States of America
• Maki-do, Japan
• Malå Geo Museum, Sweden
• Tham Malai, Thailand
• Malanaphy Springs, United States of America
• Malá Pravčická Brána, Czech Republic
• Le Scialet de Malaterre, France
• Malayil Kallan Guha, India
• Malcham Salt Cave, Israel
• Grotta a Male, Italy
• Shpella e Maligradit, Albania
• Malinta Tunnel, The Philippines
• Malmberget Iron Mine, Sweden
• Carrières souterraines de la Malogne, Belgium
• Malovaný sklep, Czech Republic
• Sentier Karstique des Malrochers, France
• Victorian Music Hall Malt Cross, Great Britain
• Cueva de Maltravieso, Spain
• Rokle Malý Kyseľ, Slovakia
• Jama Mamet, Croatia
• Mammoth Spring, United States of America
• Mammoth Cave National Park, United States of America
• Margaret River Caves - Mammoth Cave, Australia
• Mammoth Hot Springs, United States of America
• Dachstein-Mammuthöhle, Austria
• Grutas del Mamut, México
• Monastery Cave Restaurant, North Macedonia
• Jacuzzi of Manati, Puerto Rico
• Manazan Mağaraları, Turkey
• Manchester Cave, United States of America
• Caverna da Mandaçaia, Brazil
• Mandarado Yagura Caves, Japan
• Gruta da Mangabeira, Brazil
• Minas de Manganeso de Puras de Villafranca, Spain
• Mangapohue Natural Bridge, New Zealand
• Mangapwani Slave Cave, Tanzania
• Mangapwani Coral Cavern, Tanzania
• Grotta Mangiapane, Italy
• MangupKale, Russia
• Špilja Manita Peć, Croatia
• Manitou Cliff Dwellings, United States of America
• Manjang Gul, South Korea
• Manjushree Gufa, Nepal
• Mansfeld Museum, Germany
• Grotta Maona, Italy
• Maori Leap Cave, New Zealand
• Mapu’a a Vaea, Tonga
• Gruta do Maquiné, Brazil
• Maquoketa Caves State Park, United States of America
• Marakoopa Cave, Australia
• Maramagambo Caves, Uganda
• Mar Antonios Kozhaya, Lebanon
• Deir Mar Antonios, Egypt
• Grotta di Maratea, Italy
• Maratika Gufa, Nepal
• Grutas de las Maravillas, Spain
• Cueva de las Maravillas, Dominican Republic
• Gruta de las Maravillas de Ibdes, Spain
• Marble Arch Caves, Ireland
• Domaine de Marc Brédif, France
• Le musée de la Mine Marcel Maulini, France
• Musée Mémorial de la Ligne Maginot du Rhin, France
• Cuevas de la Mare de Deu, Spain
• Marengo Cave National Landmark, United States of America
• Vai Marere, Cook Islands
• Maresha, Israel
• Margate Caves, Great Britain
• Margate Grotto, Great Britain
• Tannes et glacières du Margériaz, France
• Goa Margo Tresno, Indonesia
• Baños de Doña María de Padilla, Spain
• Gruta da Maria Encantada, Portugal
• Maria im Stein, Germany
• Zambra María la Canastera, Spain
• Miniexpozíca Ťažby a Spracovania Bridlice v Marianke, Slovakia
• Maribel New Hope Cave, United States of America
• Marie-Jeanne Cave, Haiti
• Besucherbergwerk Marie Louise Stolln, Germany
• Marienglashöhle, Germany
• Marienschlucht, Germany
• Štoly Marie pomocná a Koňská jáma, Czech Republic
• Ristorante Grotta Marinara, Italy
• Markova Pećina, Serbia
• Markt Höhler, Germany
• Mark Twain Cave, United States of America
• Besucherbergwerk Markus Semmler, Germany
• Monastery of Mar Lishaa, Lebanon
• Marmarospilia, Greece
• Burg Marmels, Switzerland
• Catedral de Marmol, Chile
• Marneef Cave, Oman
• Caverna do Maroaga, Brazil
• Domačija Marof, Slovenia
• Maropeng, South Africa
• Mar Qayuma Monastery, Iraq
• Musée départemental du Sel de Marsal, France
• Les Caves de Marson, France
• Marstrand Caves, Sweden
• G.H. Martel et C°, France
• Sima Martel, Venezuela
• Martha Mine, New Zealand
• Gisement préhistorique du Martinet, France
• Cueva de Martín Infierno, Cuba
• Martinsloch, Switzerland
• Martvili Canyon, Georgia
• Marvel Cave, United States of America
• Mary Campbell Cave, United States of America
• Mary Kathleen Mine, Australia
• Mary King's Close, Great Britain
• Aven de Marzal, France
• Miniera Marzoli, Italy
• Múzeum baníctva a hutníctva Maša, Slovakia
• Grotta di Masaniello, Italy
• Mascot Mine, Canada
• Cuevas del Masical, Honduras
• Masitise Cave House Museum, Lesotho
• Hammam Maskhoutine, Algeria
• Rifugio Antiaereo Martana, Italy
• Grotto of Massabielle, France
• Massacre Cave, Great Britain
• Museo della Miniera Massa Marittima, Italy
• Museo di Arte e Storia delle Miniere, Italy
• Maison des Pierreux de Massangis, France
• Miniera di Masua, Italy
• Minas de Matahambre, Cuba
• Matala Caves, Greece
• Grottes de Matata, France
• Tham Mat Cha Pla Won, Thailand
• Matchless Mine, United States of America
• Materasum Ipogeo, Italy
• Matevulu Blue Hole, Vanuatu
• Động Mã Tiên, Vietnam
• The Cave Homes of Matmâta, Tunisia
• Grotta Matromania, Italy
• Matsuda Limestone Cave, Japan
• Matsushiro Underground Imperial Headquarters, Japan
• Jaskyňa mŕtvych netopierov, Slovakia
• Mátyáshegy barlang, Hungary
• Mauerwald, Poland
• Mau Mau Caves, Kenya
• Mau Mau Cave Nairobi, Kenya
• Mauna Loa Tree Molds, United States of America
• Důl Mauritius, Czech Republic
• Mavri Spilia - Black Cave, Greece
• Mavri Spilia - Black Cave, Greece
• Mawjymbuin Cave, India
• Krem Mawsmai, India
• Bergbau-Schaustollen Max, Germany
• Grottes de Maxange, France
• Maximiliansgrotte, Germany
• Maximushöhle - The "Catacombs" of Salzburg, Austria
• Mayener Grubenfeld, Germany
• Musée de May-sur-Orne, France
• Mazi Underground Settlement, Turkey
• McConnell Springs, United States of America
• McGregor's Cave, Great Britain
• Meadowcroft Rockshelter, United States of America
• Museo de la Minería del País Vasco, Spain
• Jaskinia w Mechowie, Poland
• Mecsek Bányászati Múzeum, Hungary
• Động Mê Cung, Vietnam
• Gruta de la Virgen de la Medalla Milagrosa, Argentina
• Medicine Rocks State Park, United States of America
• Medieval Louvre Underground, France
• Santuário da Penha, Portugal
• Grotte de Médous, France
• Medvedia štôlňa, Slovakia
• Medvidina špilja, Croatia
• Höhler von Meerane, Germany
• Louisville Mega Cavern, United States of America
• Megali Spilia, Greece
• Pećina Megara, Bosnia and Herzegovina
• Mega Spiléo - The Great Cave, Greece
• Meidan Bazar, Georgia
• Meishan Longgong Karst Cave, China
• Mejiro-do, Japan
• Melek-Chesmensky Kurgan, Russia
• Spilaio tou Melidoniou, Greece
• Limni Melissani, Greece
• Musée des Mines d'Argent des Rois Francs, France
• Mellieħa Cave and Spring, Malta
• Mělnické Podzemí, Czech Republic
• Mencilis Mağarası, Turkey
• Mendenhall Ice Caves, United States of America
• Cueva de Mendukilo, Spain
• Menfudo shonyudo, Japan
• Cuevas de Menga y Viera, Spain
• Menggong Guanyin Dong, China
• Meramec Caverns, United States of America
• Grotte delle Meraviglie, Italy
• Mercer Caverns, United States of America
• Mercier, France
• Grotte de la Mer de Glace, France
• Sentier Karstique du Grand Bois, France
• Erlebnis Bergwerk Merkers, Germany
• Merlin's Cave, Great Britain
• Mermaid’s Lair Cave, Bahamas
• Mermerna Pecina, Serbia
• Pozzo del Merro, Italy
• Grotte Prehistorique des Merveilles, France
• Grotte Merveilleuse, Algeria
• Grotte La Merveilleuse, Belgium
• Mesa Arch, United States of America
• Mesa Verde NP, United States of America
• Caves of Messalit, Morocco
• Balma del Messere, Italy
• Grottes de Beaume les Messieurs, France
• Mészégető-forrásbarlang, Hungary
• Römerbergwerk Meurin, Germany
• Mewlaghmore Dolines, Ireland
• Die Meyerschen Stollen, Switzerland
• Le Grand Canyon de Meyrangle, France
• Peştera Meziad, Romania
• Rudnik svinca in cinka Mežica, Slovenia
• Mezmaiskaya Cave, Russia
• Důl Michal, Czech Republic
• Ouvrage du Michelsberg, France
• Micheongul, South Korea
• La Micoque, France
• Miedzyrzecki Rejon Umocniony, Poland
• Mikaelshulen, Norway
• Underground Kingdom Mikawa Mu Valley, Japan
• Mikurodo Cave, Japan
• Grotte de Milandre, Switzerland
• Milarepa's Cave, China
• Milatos Andron, Greece
• Mileştii Mici, Moldova
• Milk Grotto Chapel, Israel
• Milky Way Glow Worm Cave, New Zealand
• Millennium Cave, Vanuatu
• Millennium Underground Museum, Hungary
• Millican Daltons Cave, Great Britain
• Millie Mine Bat Cave, United States of America
• Aguas Turquesas Millpu, Perú
• Cueva del Milodon, Chile
• Altes Kalkbergwerk Miltitz, Germany
• Milton House, United States of America
• Mimbi Caves, Australia
• La Forteresse de Mimoyecques, France
• Goa Mimpi, Indonesia
• Museo de la Mineria, México
• Cueva de Las Minas, Guatemala
• Sklep pod Novou Radnicí, Czech Republic
• Mindemoya Cave, Canada
• Mine Howe, Great Britain
• Minera Lead Mines, Great Britain
• Minerail, France
• Museum of Mineralogy, Petrology and Mineral Resources, Bulgaria
• Museo dei Minerali Elbani, Italy
• Mineraliengrotte Vorderkrimml, Austria
• Mineralienhöhler, Germany
• Miners' Dugouts, Australia
• Miners Heritage Walk-In Mine, Australia
• Ponts Naturels à Minerve, France
• Mines & Meadows ATV Riding Resort, United States of America
• Mines View Park, The Philippines
• Minigill Cave, Canada
• Minnesota Museum Of Mining, United States of America
• Smaragdgruvene Byrud Gård, Norway
• Minnetonka Cave, United States of America
• Minntac Plant, United States of America
• Mintaro Slate Quarries, Australia
• Mir Diamond Mine, Russia
• Grotta del Miracolo, Italy
• Grutas de Mira de Aire, Portugal
• Polje de Mira-Minde, Portugal
• Miskolc-Tapolca, Hungary
• Mission Mine, United States of America
• Missouri Mines State Historic Site, United States of America
• Cavernas Misteriosas, Brazil
• Cave Creek Mistress Mine, United States of America
• Mitchell Caverns, United States of America
• Mitchells Gully Gold Mine, New Zealand
• Mitchelstown Cave, Ireland
• Mitha Cave, Oman
• Mithraeum, Italy
• Mithraeum San Clemente, Italy
• Mitsugo shonyudo, Japan
• Mittelbau Dora - Mittelwerk Dora, Germany
• L-għar ta´ Mixta, Malta
• Miyama Shonyudo, Japan
• Mizamiza Cave, Tanzania
• Mizonoguchi dokutsu, Japan
• Mladečské jeskyně, Czech Republic
• Mlynky Cave, Ukraine
• Peștera Moanei, Romania
• Moaning Caverns, United States of America
• Missouri Botanical Garden, United States of America
• Izviri v Močilnik, Slovenia
• Modlivý důl, Czech Republic
• Modra Spilia - Blue Grotto, Croatia
• Modrić Špilja, Croatia
• Grutas da Moeda, Portugal
• Möllschlucht, Austria
• Mønsted Kalkgruber, Denmark
• Moët & Chandon, France
• Mogok Gem Mines, Myanmar
• Grotte des Moidons, France
• La Cave Aux Moines, France
• Mokolea Lava Pools, United States of America
• Mokranjska Miljacka, Bosnia and Herzegovina
• Muzeum vltavínů, Czech Republic
• Pulo di Molfetta, Italy
• Puig des Molins Nekropolis, Spain
• Mollie Kathleen Mine, United States of America
• Hang Mỏ Luông, Vietnam
• Museum of Old and New Art, Australia
• Monasterio de Piedra Natural Park, Spain
• Monastery Cave Hotel, Turkey
• Món De Sal, Spain
• Grotta Monello, Italy
• Monfort Bat Cave, The Philippines
• Karstlehrpfad Monheimer Alb, Germany
• Monks' Prison, Greece
• Les Caves Monmousseau, France
• Monsanto, Portugal
• Montagu Guano Cave, South Africa
• Parco Minerario del Monte Amiata, Italy
• Grotta del Monte Capriolo, Italy
• Museo delle Miniere di Montecatini, Italy
• Grotta di Monte Cucco, Italy
• Grotta del Monte Ermada, Italy
• Montelimar Cave, Nicaragua
• Miniera Monteponi, Italy
• Montepulciano La Città Sotterranea, Italy
• Grotta del Monte Querceto, Italy
• Monte Sant'Angelo sul Gargano, Italy
• Cueva de Montesinos, Spain
• Miniera Montevecchio, Italy
• Grotta di Montevicoli, Italy
• Montezuma Castle National Monument, United States of America
• Montezuma Well, United States of America
• Grotte de Mont-Fat, Belgium
• Grotte de Montgaudier, France
• Chaos de Montpellier-le-Vieux, France
• La Ville Souterraine, Canada
• Montreal Goldfield, Australia
• Santa Cova de Montserrat, Spain
• Réservoir de Montsouris, France
• Cisternas Romanas de Monturque, Spain
• Matera Olive Oil Museum, Italy
• Temple of the Moon, Perú
• Margaret River Caves - Moondyne Cave, Australia
• Moon Hill, China
• Moonhole, Saint Vincent and the Grenadin
• Moon Water Cave, China
• Tunnels of Moose Jaw, Canada
• Moqal Cave, Oman
• Moqui Cave, United States of America
• Moqui Sand Caves, United States of America
• Tham Morakot, Thailand
• Schaubergwerk Morassina, Germany
• Moravská Banka Vín, Czech Republic
• Dům přírody Moravského krasu, Czech Republic
• Morden Colliery, Canada
• Mordloch, Germany
• Cave Bar More, Croatia
• Morefield Gem Mine, United States of America
• Morenci Mine, United States of America
• Paraje de la Morería, Spain
• Cueva de Morgan, Colombia
• Grottes de Morgat, France
• Besucherstollen Morgenstern, Germany
• Morgia Sant'Angelo, Italy
• Museo delle Miniere di Morgnano, Italy
• Khazad-dûm, Middle-Earth
• Caverna do Morro do Couto, Brazil
• Morro do Ouro, Brazil
• Caverna do Morro Preto, Brazil
• Tunnel du Mortier, France
• Morwellham Quay, Great Britain
• Moscow Metro, Russia
• Moseløkken Stenbrudsmuseum, Denmark
• Mo So Cave, Vietnam
• Motena Cave, Georgia
• Mother Shipton's Cave, Great Britain
• Motouleng Caves, South Africa
• Motuanga Cave, Cook Islands
• Les Moulins Souterrains du Col-des-Roches au Locle, Switzerland
• Grotte de Moulis, France
• Laboratoire Souterrain de Moulis, France
• Cave of the Mounds, United States of America
• Mountain Maid Gold Mine, Australia
• Moun Ta Wa Cave, Myanmar
• Mount Lyell Copper Mine, Australia
• Mount Suswa Caves, Kenya
• Cova dos Mouros, Portugal
• Abri du Moustier, France
• Peştera Movile, Romania
• Mozrovi, Armenia
• Mramornaja, Russia
• Špilja Mramornica, Croatia
• Jaskinia Mroźna, Poland
• Mt Omuro Lava Caves, Japan
• Hang Múa, Vietnam
• Tham Muang On, Thailand
• Cenotes Hacienda Mucuyché, México
• Bergbau- und Heimatmuseum Mühlbach, Austria
• Mühlbachquellhöhle, Germany
• Spring von Mühlberg, Germany
• Mühlheimer Höhle, Germany
• Alaunwerk Mühlwand, Germany
• Cueva de la Muerte, Costa Rica
• Peştera Muierilor, Romania
• Mukyudou, Japan
• Mulgol Cave, South Korea
• Valle dei Mulini, Italy
• Mulwaree Cave, Australia
• Mumba Rockshelter, Tanzania
• G.H. Mumm, France
• Mungyeong Coal Museum, South Korea
• Munkastova Cave, Faroe Islands
• Muqattam Mountain Cave Cathedral, Egypt
• Cueva de los Murciélagos, Spain
• Muro Iwa Cave, Japan
• Musanze Cave, Rwanda
• Musée du Vin, France
• Musejnaja, Russia
• Museo Arqueológico, Spain
• Museo civico archeologico del Distretto minerario, Italy
• Museo Canario, Spain
• Museu de Minas Ouro Prêto, Brazil
• Museu de Temàtica Espeleològica, Spain
• Slovenské múzeum ochrany prírody a jaskyniarstva, Slovakia
• Waitomo Caves Discovery Centre, New Zealand
• Museum Hotel, Turkey
• Museum Karst Indonesia, Indonesia
• Museo della Scultura Contemporanea Matera, Italy
• Mustang Caves, Nepal
• Cistern of Ancient Mycenae, Greece
• Jaskinia Mylna, Poland
• Rock-cut Tombs in Myra, Turkey
• Mysterium Fidei, Malta
• Mystery Cave, United States of America
• Mystic Caverns, United States of America
• Zeche Nachtigall, Germany
• El Nacimiento, México
• Cuoléto de Nadale, Italy
• Ledová Jeskyně Naděje, Czech Republic
• Izvir Nadiže, Slovenia
• Nagarjuna Caves, India
• Nahal Me’arot Caves, Israel
• Cenote Naharon, México
• Nahehe Cave, Fiji
• Naica Crystal Caves - Cueva de las Espadas - Cueva de los Cristales, México
• Naigu Stone Forest, China
• Naj Tunich, Guatemala
• Nakabari Limestone Cave, Japan
• Nakalele Blowhole, United States of America
• Nakatonbetsu Limestone Cave, Japan
• Nakatsu Gorge, Japan
• Tham Nakha, Thailand
• Nakilbent Sarnıçı, Turkey
• Nakimu Caves, Canada
• Nakoroloaloa Cave, Fiji
• Mănăstirea Nămăiești, Romania
• Tham Nam Bang, Thailand
• Goldbergwerk Name Gottes, Germany
• Tham Nam Khao Siva, Thailand
• Nammongyi Blue Lagoon, Myanmar
• Tsingy de Namoroka, Madagascar
• Nanaimo Museum, Canada
• Nanaori shonyudo, Japan
• Nanatsugama shonyudo, Japan
• Nanda Blue Hole, Vanuatu
• Tham Nang Ene, Laos
• Nanjiang Grand Canyon, China
• Nanjing Ape Man Cave, China
• Nanshiku Temple, China
• La Cité Souterraine de Naours, France
• Grotte de Napoléon, France
• Museo del Sottosuolo Napoletano, Italy
• Napoli Sotterranea, Italy
• Jeskyne Na Pomezi, Czech Republic
• Miniera di Naracauli, Italy
• Horreum de Narbonne, France
• Narni Sotterranea, Italy
• Narusawa Fuketsu, Japan
• Narva Victoria Bastioni kasematid, Estonia
• Nascente Azul, Brazil
• Nashoba Brook Stone Chamber, United States of America
• Jeskyně Na Špičáku, Czech Republic
• Gruta do Natal, Portugal
• National Coal Mining Museum for England, Great Britain
• National Corvette Museum, United States of America
• National Justice Museum, Great Britain
• Národi Technické Muzeum, Czech Republic
• Grotto of the Nativity, Israel
• Natural Arch Scenic Area, United States of America
• Natural Bridge Caverns, United States of America
• Natural Bridge Caverns, United States of America
• Caverns at Natural Bridge, United States of America
• Natural Bridge State Resort Park, United States of America
• Alabama's Natural Bridge, United States of America
• Natural History Museum Rijeka, Croatia
• Natural Stone Bridge and Caves, United States of America
• Natural Tunnel, United States of America
• Natur Eis Palast Hintertuxer Gletscher, Austria
• Museum Festung Nauders, Austria
• Naung Mya Hlwe Cave, Myanmar
• Vai Nauri, Cook Islands
• Navenakhevi Cave, Georgia
• Navghan Kuvo, India
• Naypyitaw Gem Museum, Myanmar
• Neanderthal, Germany
• Nebelhöhle, Germany
• Necromanteion of Ephyra, Greece
• Nederland Mining Museum, United States of America
• Needle's Eye, United States of America
• Neischlhöhle, Germany
• Neitsikoobas, Estonia
• Nemo 33, Belgium
• Mina de Sal de Nemocón, Colombia
• Nenthead Mines Heritage Centre, Great Britain
• Grottes de Neptune, Belgium
• La Cueva de Nerja, Spain
• Neronian Cryptoporticus, Italy
• Nesmith Cave, United States of America
• Spílio tou Nestóros - Nestor's Cave, Greece
• Netherton Tunnel Branch Canal, Great Britain
• Nettle Cave, Australia
• Grotte di Nettuno, Italy
• Neubeurer Wolfsschlucht, Germany
• Neubulach - Hella-Glück-Stollen, Germany
• Musée des Mines de Fer de Neufchef, France
• Karstkundlicher Wanderweg Neuhaus/Pegnitz, Germany
• Casemate de Neunhoffen, France
• Neustädtler Hobbybergwerk, Germany
• Nevada State Museum Silver Mine Exhibit, United States of America
• Speleo Rando de la Tanne du Neve, France
• Nevşehir Yeraltı Şehri, Turkey
• Newdegate Cave (Hastings Caves), Australia
• Newgrange, Ireland
• New Mexico Mining Museum, United States of America
• Newnes Glow Worm Tunnel, Australia
• Nezer Cave, Israel
• Nezhnaya Cave, Russia
• Ngalue Cave, Mozambique
• Ngarua Caves, New Zealand
• Ngilgi Cave, Australia
• Giếng Ngọc Gia Sinh, Vietnam
• Động Ngườm Ngao, Vietnam
• Ngwenya Mine, Eswatini
• Nhi Thanh Cave, Vietnam
• Niagara Cave, United States of America
• Gua Niah, Malaysia
• Grotte de Niaux, France
• Northern Ireland´s Secret Bunker, Ireland
• Cave of Nicanor, Israel
• La Crypte Archéologique de Nice, France
• Grottes de Nichet, France
• Nicolai-Stollen, Czech Republic
• Nidlenloch, Switzerland
• Niedaltdorfer Tropfsteinhöhle, Germany
• Jaskinia Niedźwiedzia, Poland
• Evil Dragon Cave/Righteous Dragon Cave, China
• Jaskinia Nietoperzowa, Poland
• Nigardsbreen Ice Cave, Norway
• Fortress of Niha, Lebanon
• Nikau Cave, New Zealand
• Die historische Grotte in den Herrenhäuser Gärten, Germany
• Nilavarai Bottomless Well, Sri Lanka
• Nildiya Pokuna Cave, Sri Lanka
• Nilometer, Egypt
• Nimara Mağarası, Turkey
• Chaos de Nîmes-le-Vieux, France
• Laguna de la Niña Encantada, Argentina
• St Ninian's Cave, Great Britain
• Għar Ninu, Malta
• Nippara shonyudo, Japan
• Nippon Mining Museum, Japan
• Niter Ice Cave, United States of America
• Pigeonnier de la Niverdière, France
• Cave Nivida, Panama
• Nixhöhle, Austria
• Nixseebecken, Germany
• Niya-Thiya Cave, Japan
• Banícka a geologická expozícia v Nižnej Slanej, Slovakia
• Njoro River Cave, Kenya
• The No. 9 Mine & Museum, United States of America
• Nobesawa Ginkodo, Japan
• Noccalula Falls, United States of America
• Nodong Cave, South Korea
• Musée de la Mine Noeux-les-Mines, France
• Nohoch Nah Chich, México
• Nõiakaev, Estonia
• Noirmont Command Bunker, Great Britain
• Nonsuch Caves, Jamaica
• Atlantikwall Museum Noordwijk, Netherlands
• Noravank, Armenia
• Gruvmuseet Norberg, Sweden
• Nordmarks museum, Sweden
• Grottes de la Norée, France
• North Glory Hole, Australia
• North Head Tunnels, New Zealand
• Norwich Guildhall Crypt, Great Britain
• Farkaskői Alkotótelep, Hungary
• Nothklamm, Austria
• Eisenerzgrube Nothweiler, Germany
• Notranjski muzej Postojna, Slovenia
• Notre Dame du Scex, Switzerland
• City of Caves, Great Britain
• Nottingham Castle Cave Tours, Great Britain
• Museum of Nottingham Life, Great Britain
• Pohronské múzeum Nová Baňa, Slovakia
• Novakova pećina, Bosnia and Herzegovina
• Parco Fluviale Novella, Italy
• Novomuradymovskaya Peshchera, Russia
• Novoafonskaya, Georgia
• Muzeum Gornictwa Podziemnego w Nowej Rudzie, Poland
• Musée de la mine de Noyant-d'Allier, France
• National Stone Centre, Great Britain
• Nuevo Tolima, Colombia
• Null Stern Hotel, Switzerland
• Nuoshui Dongtian, China
• Grotta Nuova, Italy
• Nurau Hohle, Cook Islands
• Underground City of Nushabad, Iran
• Nutty Putty Cave, United States of America
• Ny-Ålesund By- og Gruvemuseum, Norway
• Amabera ga Nyinamwiru, Uganda
• Grotte aux Nymphes, Switzerland
• Nyvångs kolgruva, Sweden
• Feste Obergentringen, France
• Oberharzer Bergwerksmuseum, Germany
• Gipsbergwerk Oberwiesen, Switzerland
• Bergbau- und Mineralienmuseum Oberwolfach, Germany
• Historische Silbergruben Oberzeiring, Austria
• Obir Tropfsteinhöhlen, Austria
• WISMUT Objekt 90, Germany
• Jaskinia Obłazkowa, Poland
• Obodska Cave, Montenegro
• Grotte de l'Observatoire, France
• Ocean Hole, Bahamas
• Sa Oche 'e Su Bentu, Italy
• Ochozská jeskynĕ, Czech Republic
• Ochtinska Aragonitova Jaskyna, Slovakia
• Wasserbaum von Ockensen, Germany
• Salina Ocnele Mari, Romania
• Mina de Visitação Octávio Fontana, Brazil
• Odaira shonyudo, Japan
• Odelsteinhöhle, Austria
• Odin Mine, Great Britain
• Odisejeva Špilja, Croatia
• Öblarner Kupferweg, Austria
• Bergbaumuseum Oelsnitz, Germany
• Ötscher Tropfsteinhöhle, Austria
• Ötschergräben, Austria
• Ofnethöhlen, Germany
• Ogba Ogbunike, Nigeria
• Ogoya Mine Museum, Japan
• Ogulla Spring, Ireland
• Ohio Caverns, United States of America
• Ohtake shonyudo, Japan
• Ohtaki shonyudo, Japan
• Centre de la mine et du chemin de Fer Oignies, France
• Uamh an Oir, Great Britain
• Oja de Agua, México
• Ekspozycja Przyrodnicza Ojców, Poland
• Ojika-do, Japan
• Ojo de Agua, México
• Ojo Guareña, Spain
• Minas de Ojos Negros, Spain
• Ojukwu Bunker, Nigeria
• Okatse Canyon, Georgia
• Cave Okinawa, Japan
• Okubo Mabu Mine, Japan
• Caverna de la Olada, Perú
• Old Cardinal Gem Mine, United States of America
• Old City Hall Station, United States of America
• Old Dominion Mine Park, United States of America
• Old Hundred Gold Mine Tour, United States of America
• Old New-Gate Prison & Copper Mine, United States of America
• Old Spanish Treasure Cave, United States of America
• Old Timers Mine, Australia
• Old Water Wheel, Australia
• O'Leno State Park, United States of America
• Olentangy Indian Caverns, United States of America
• Olgahöhle, Germany
• Caverna Olhos D'Água, Brazil
• Grotte di Oliero, Italy
• Spilia Olimbi, Greece
• Norsk Oljemuseum, Norway
• Oljeön, Sweden
• Cueva de la Olla, México
• Olla Quemada, Costa Rica
• Ol Njorowa Gorge, Kenya
• Oloolua Cave, Kenya
• Cheile Oltețului, Romania
• Olumo Rock, Nigeria
• Olympic Dam Mine, Australia
• Izvor Omble, Croatia
• Gorges d'Ombleze, France
• Omuru Flying Fox Cave, Papua New Guinea
• Onagara shonyudo, Japan
• Cueva de Oñati-Arrikrutz, Spain
• Ondaldong Gul, South Korea
• Oneota Gorge, United States of America
• Grotta dell'Onferno, Italy
• Las grutas de Ongamira, Argentina
• Onigashima Cave, Japan
• Onondaga Cave, United States of America
• Onyx Cave at Guntown Mountain, United States of America
• Onyx Mountain Caverns, United States of America
• Onyx Cave Park, United States of America
• Slovenské Opálové Bane, Slovakia
• Oparara Arch, New Zealand
• Podziemia Opatowskie w Opatowie, Poland
• Oppenheimer Kellerlabyrinth, Germany
• Optymistychna, Ukraine
• Orakei Korako, New Zealand
• Cascada de Orbaneja del Castillo, Spain
• Gorges de l'Orbe, Switzerland
• L'Orbiere, France
• Ordinskaya Peschtera, Russia
• Oregon Caves, United States of America
• Organ Cave, United States of America
• Aven d'Orgnac, France
• Oribi Gorge, South Africa
• Orient Cave, Australia
• Grotte d'Orjobet, France
• Orlovaca Cave, Bosnia and Herzegovina
• Orlova Čuka, Bulgaria
• Grottes de Ornolac, France
• Cueba de Oro, The Philippines
• Museo del Oro Bogotá, Colombia
• Museo del Oro Precolombino, Costa Rica
• Oroszlány Bányász Múzeum, Hungary
• Orphan Girl Mine, United States of America
• Cueva de la Orquidea, México
• La Grotta dell'Orso, Italy
• Cuevas de Ortigosa, Spain
• Orvieto, Italy
• Osarizawa Mine, Japan
• Osawa Limestone Cave, Japan
• Grotte di Osimo, Italy
• Museum Industriekultur Osnabrück, Germany
• Senda del Oso, Spain
• Osowka Complex, Poland
• Grotte d'Osselle, France
• Ossian's Cave, Great Britain
• Ossian's Cave, Great Britain
• Ossian's Cave, Great Britain
• Skalní město Ostaš, Czech Republic
• Bergbau- und Industriemuseum Ostbayern, Germany