Places To Visit
- Złoty Stok Gold Mine
- Abri de Bockange, Maginot Line
- Abri de Hatten, Maginot Line
- Acomb York ROC Group HQ
- Alderley Edge Mines
- Aldwych Holborn Branch Line
- Anstruther Rotor Radar Station and Scotland North Zone HQ
- Archaeological Crypt of Notre Dame
- Arholma Battery
- Arras Boves
- Arras Citadel
- Barons' Cave
- Battery Lothringen and Command Post
- Battery Moltke, Jersey
- Beer Quarry Caves
- Berlinertor Bunker, Hamburg
- Berwyn Tunnel
- Bethnal Green Underground Station
- Biesenthal Stasi Bunker (5005)
- Bitche Citadel
- Blegny Coal Mine
- Blickling Ice House
- Blisworth Canal Tunnel
- Blochplatz Bunker
- Blue John Caverns and Mine
- Bochnia Salt Mine
- Bock Casemates
- Bohus Fortress, Kungälv
- Bois des Huit Rues V1 Launch Site
- Bouda Artillery Fortress
- Brede Southern Water Emergency Control Centre
- Brighton Police Cells Museum
- Bristol Clifton Rocks Tunnel
- Broadway ROC Post
- Broch of Gurness
- Brunkebergstunneln
- Bubeneč Sewage Works
- Calais German Naval Bunker/WWII Museum
- Calke Abbey Gardeners' Tunnel
- Cambrai Citadel
- Canal Saint-Martin Tunnel
- Cardiff Castle Air Raid Shelters
- Casemate Esch, Maginot Line
- Castlelaw Hill Fort and Earth House
- Caverne du Dragon
- Chapelle Sainte-Radegonde de Chinon
- Cheddar Caves
- Chelm Chalk Mine
- Chislehurst Caves
- Churchill (Cabinet) War Rooms
- Château de Brézé
- Civil Defence Control Centre Gravesend
- Clapham South Deep Shelter
- Coalhouse Fort
- Coleshill Replica Operational Base
- Colinton Tunnel
- Complex Włodarz, Project Riese
- Coombe Conduit
- Couriot Coal Mining Museum, St Etienne
- Coventry Cathedral Crypts
- Creswell Crags
- Cruachan Power Station - The Hollow Mountain
- Crystal Gypsum Cave
- Cuckfield ROC Post
- Culsh Earth House
- Cwmorthin Slate Quarry
- Dan-Yr-Ogof Caves
- Dark Arch, Parlington Hall
- Darnley Mausoleum
- Die Klocke Ludwikowice Kłodzkie
- Dobrošov Artillery Fort
- Domqueur Muches
- Dover Castle AAOR (Casemate Level)
- Dover Castle Medical Dressing Station (Annexe Level)
- Drakelow WW2 Shadow Factory RSG and RGHQ
- Dudley Canal Tunnel
- East Pool Mine
- Eperlecques V2 Bunker
- Exeter Underground Passages
- Falkirk Canal Tunnel
- Fan Bay Deep Shelter
- Femore Fort
- Fort Amherst
- Fort de l'Aisne
- Fort Douaumont
- Fort du Roule
- Fort Eben-Emael
- Fort Guentrange
- Fort Schoenenbourg, Maginot Line
- Fort Srebrna Góra
- Fort Vaux
- Gatti's Ice House - London Canal Museum
- Geevor Tin Mine
- George and Charlotte Copper Mine
- George Vaults Rochester
- Gesundbrunnen Air-Raid Shelter
- Giants Cave
- Gilmerton Cove
- Golgotha Tunnel
- Goodluck Lead Mine
- Grassington Moor Lead Mines
- Great Masson Cavern
- Great Orme Mines
- Great Rutland Cavern / Nestor Mine
- Great Siege Tunnels
- Greenwich Foot Tunnel
- Greys Court Ice House
- Grimes Graves
- Gros Ouvrage Cap Martin, Maginot Line
- Gros Ouvrage Hackenberg, Maginot Line
- Gros Ouvrage Hochwald Maginot Line
- Gros Ouvrage L'Agaisen, Maginot Line
- Gros Ouvrage Sainte-Agnès, Maginot Line
- Grove Colliery
- Gävle Coastal Artillery Fort
- Hack Green Rotor Radar Station and RGHQ
- Halliggye Fogou
- Ham House Ice House
- Hammarkullen Tram Stop, Gothenburg
- Hanbury Hall Ice House
- Hanička Artillery Fort
- Harecastle Tunnel, Trent and Mersey Canal
- Harnekop Nuclear Bunker
- Hartmannswillerkopf Trench System
- Hastings West Hill Cliff Railway
- Havstoudd Battery, Hemsö
- Hawkstone Park
- Hellfire Caves
- Hexham Abbey Crypt
- High Elms Ice House
- Highgate Cemetery
- Highgate Railway Tunnels
- Hindhead Road Tunnel
- Holbeach ROC Post
- Holmpton Rotor Radar Station
- Holy Austin Rock Houses, Kinver Edge
- Honister Slate Mine
- Hopewell Colliery
- Hughenden Manor Ice House
- Humboldthain Flak Tower
- Hurka Fort
- Ingleborough Cave
- Ipswich USW Autovon Telephone Exchange
- Jalta Hotel Prague
- Janska Underground Factory and Fuel Store
- Jersey War Tunnels (Ho8)
- Josefov Fortress
- Kanne NATO Joint Operations Centre
- Kaufmann Bunker, Hamburg
- Kelly Mine
- Kelvedon Hatch Rotor SOC and RGHQ
- Kensal Green Cemetery and Catacombs
- Kent Mining Museum
- Kents Cavern
- Killhope Lead Mining Museum
- King Edward Mine Museum
- Kingswood Ice House and Grotto
- Klodzko Cellars
- Krzemionki Prehistoric Flint Mines
- Książ Castle (Zamek Książ)
- Kutna Hora Silver Mine
- Kyiv Metro
- La Coupole
- La Hougue Bie Command Bunker
- La Hougue Bie Neolithic Passage Grave
- La Mare Mill Resistance Nest , Jersey
- Lady Victoria Colliery - National Mining Museum
- Lee Ice House
- Levant Mine
- Lezennes Stone Quarry
- Limpsfield School Air Raid Shelters
- Llanymynech Limeworks Heritage Area
- Llywernog Mine - Silver Mountain Experience
- Lochaber Geopark
- Lochnell Mine - Museum of Lead Mining
- Maastricht Casemates
- Maginot Line Gordolon Gros Ouvrage
- Maginot Line La Barbonnet Gros Ouvrage
- Maison du Fontainier
- Manchester Science and Industry Museum
- Marble Arch Caves
- Margate Shell Grotto
- Marienthal West German Government Bunker
- Mary King's Close
- Millennium Seed Bank
- Montreuil sur Mer Citadel
- Mother Shiptons Cave
- Museum of the Scottish Shale Oil Industry
- Mynydd Parys (Parys Mountain)
- Namur Citadel
- National Coal Mining Museum for England
- Nenthead Mines
- Newhaven Fort
- Northern St Pietersberg Quarry and Vault
- Nowa Ruda Coal Mine
- Odessa Catacombs
- Old Elbe Tunnel, Hamburg
- Opatów Cellars
- Oscar II Fort Gothenburg
- Osówka Underground City (Project Riese)
- Ouvrage Four-à-Chaux, Maginot Line
- Painshill Park Ice House
- Pankstrasse U-Bahn Station and Bunker
- Parc des Buttes-Chaumont
- Paris Catacombs
- Paris Sewer Museum (Musée des Égouts)
- Peak Cavern / Devil's Arse
- Pechersk Lavra (Cave Monastery) Kyiv
- Petit Ouvrage Bois Karre Maginot Line
- Petit Ouvrage Immerhof, Maginot Line
- Pooles Cavern
- Portadown ROC Post
- Porthcurno Underground Telegraph Station
- Post Office Railway (Mail Rail)
- Prague Kolektory
- Prague Metro
- Père Lachaise Cemetery
- Pétrusse Casemates
- Queensway Road Tunnel
- RAF Bentley Priory Bunker and Museum
- RAF Digby Sector Operations Room
- RAF Drytree
- RAF Laarbruch and Museum
- Ram Hill Colliery
- Ramsgate Air Raid Shelter And Scenic Railway
- Raschpëtzer Qanat
- Reigate Caves
- Rijckholt Neolithic Flint Mine
- Ronville Tunnels (Carrière Wellington)
- Royston Cave
- Rue du Commerce, Souzay-Champigny
- Rumelange Mining Museum
- Rzeczka - Sztolnie Walimskie (Project Riese)
- Saint Michael's Cave
- Saint Quirin Chapel
- Saint-Sulpice Crypt
- Sedan Citadel
- Sedlec Ossuary
- Sherborne House Ice House
- Siarö Fort
- SKF Underground Factory Gothenburg
- Skirwith Cave
- Sloup Castle
- Smoo Cave
- Snaefell Rotor Radar Station
- Snailbeach Mine
- Snobs' Tunnel, Hanbury Hall
- South Foreland RHQ Deep Shelter
- South Street Caves Dorking
- Speedwell Cavern
- Spiennes Neolithic Flint Mines
- St Clements Caves
- St Matthews School Air Raid Shelter
- Standedge Tunnels
- Steintorwall Bunker, Hamburg Central Station
- Stockholm Metro (Tunnelbana)
- Stockport Air Raid Shelters Chestergate
- Stone Point ROC Post
- Storråberget Fortress, Hemsö
- Strombierg Gypsum Mines
- Strongpoint Corbiere, Jersey
- Stump Cross Cavern
- Säve Airfield Underground Hangar
- Tar Tunnel
- Tessin Naval Command Bunker
- Thames Tunnel and Brunel Museum
- The Grand Redoubt
- The Grand Shaft
- The Margate Caves (Vortigern's Cavern)
- The Nursemaids' Tunnel
- Treak Cliff Cavern
- Tunnellers' Memorial, Givenchy-lès-la-Bassée
- Tunnels Beaches, Ilfracombe
- Uxbridge Battle of Britain Ops Room
- Verclut Point Casemate, Jersey
- Verdun Citadel
- Veryan ROC Post
- Victoria Tunnel
- Vimy Ridge and Tunnels
- Warren Street Underground Station
- Watermouth Caves
- Wedel Auxiliary Hospital Bunker
- Wemyss Caves
- Western Approaches Headquarters
- Wheal Martyn China Clay Works
- White Scar Cave
- Wieliczka Salt Mine
- Wilhemsburg Flak Tower Hamburg
- Williamson's Tunnels
- Wookey Hole
- Woolwich Arsenal Elizabeth Line Station
- Woolwich Foot Tunnel
- Wrocław Contemporary Museum (Muzeum Współczesne Wrocław)
- Wünsdorf Military Base
- Zonneberg Quarry
