- Anchor Church
- The Angel Microbrewery Cave
- Battle of Britain Control Room
- Beer Quarry Caves
- Bell Inn Caves
- Blair Street Underground Vaults
- Bounce Below
- Brighton's Victorian Sewer
- Bruce's Cave
- Burlington
- Cabinet War Rooms
- Café in the Crypt
- Caldecotte Project
- Cave Escape Nottingham
- Cavern Club
- The Channel Island Military Museum
- Channel Tunnel
- Chislehurst Caves
- Churchill's Secret Bunker
- Crowborough Caves
- Cruachan Power Station
- Culver Hole
- Dewstow Gardens and Grottoes
- Dorking Caves
- Dragon Hall Undercroft
- Drakelow Tunnels
- Dudley Canal Tunnels
- Dunaskin Open Air Museum
- Tomb of the Eagles
- Electric Mountain Visitor Centre
- Essex Secret Bunker
- Euston Lost Tunnels
- Exeter's Underground Passages
- St Fillan's Cave
- Fort Amherst Tunnel Tour
- German Underground Hospital
- German Military Underground Hospital
- German Naval Signals Headquarters
- Gilmerton Cove
- Greenwich Foot Tunnel
- Guildhall Medieval Crypt
- Hack Green
- Halliggye Fogou
- Hand and Heart
- Hard Rock Vault
- Hawkstone Park
- Hellfire Corner
- Herts Young Mariners Base
- Humphrey Kynaston's Cave
- Innocent Railway Tunnel
- Ye Olde Trip to Jerusalem
- Jurnet's Bar
- Kelvedon Hatch
- Kinver Edge Rock Houses
- La Valette Underground Military Museum
- Llewelyn's Cave
- London Underground
- Lost Caves
- Maeshowe
- Victorian Music Hall Malt Cross
- Margate Caves
- Margate Shell Grotto
- Mary King's Close
- McGregor's Cave
- Mine Howe
- National Justice Museum
- Netherton Tunnel Branch Canal
- Noirmont Command Bunker
- Norwich Guildhall Crypt
- Caves of Nottingham
- Nottingham Castle Cave Tours
- Museum of Nottingham Life
- Ossian's Cave
- Painshill Park's Crystal Grotto
- Park Tunnel
- Porthcurno Telegraph Museum
- Redcliffe Caves
- The Reigate Caves
- Rhydymwyn Valley Works
- Royston Cave
- Ye Olde Salutation Inn
- Scotland's Secret Bunker
- Scott's Grotto
- Shunt
- London Silver Vaults
- Standedge Tunnel
- St Andrew's Hall Undercroft
- St Margaret's Cave
- St Peter's Bunker Museum
- Take 5 Bar
- The Bunker
- The Crypt
- Tilly Whim Caves
- Tregiffian Burial Chamber
- Tyne Tunnel
- Victoria Tunnel
- Western Approaches Command Centre
- West Norwood Cemetery Catacombs
- West Wycombe Caves
- Williamson's Tunnels
- Zigzag Path
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