Search the list...
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