Places To Visit
- Reigate Caves
- Castle Coole
- Bunker 10-Z, Brno
- Fort Radíkov
- Výpustek Caves
- Žlutý Kopec Water Cisterns, Brno
- Zelný trh Medieval Cellars, Brno
- Brede Southern Water Emergency Control Centre
- Brede Steam Giants
- Medieval Cellars, Winchelsea
- Søndermarken Cisterns
- Uppark House
- Leeds Castle Grotto
- Dudley Canal Tunnel
- Fort Luton, Chatham
- Uxbridge Battle of Britain Ops Room
- Cuckfield ROC Post
- Clapham South Deep Shelter
- Cruachan Power Station - The Hollow Mountain
- Civil Defence Control Centre Gravesend
- Pope's Grotto
- Stevns Fort
- Ejby Air Defence Bunker
- Kongelunds Fort
- Øresund Link (Øresundsbron)
- Holbeach ROC Post
- Holmpton Rotor Radar Station
- Nothe Fort, Weymouth
- Kyre Park Folly
- Cwmorthin Slate Quarry
- RAF Greenham Common
- Painshill Park Ice House and Crystal Grotto
- Absalon's Castle Ruins
- Christian's Church Crypt
- Post Office Railway (Mail Rail)
- Giants Cave
- Willow Row Barrow
- Aldwych Holborn Branch Line
- Thames Tunnel and Brunel Museum
- Warren Street Underground Station
- Woolwich Arsenal Elizabeth Line Station
- Highgate Railway Tunnels
- Inverness Raigmore Highland Emergency Centre
- Amberley Museum
- Coalhouse Fort
- Land of Iron Museum
- Clifford Road Primary School Air Raid Shelter
- Fort Nelson
- South Street Caves Dorking
- Williamson's Tunnels
- Ossuary of St James, Brno
- Capuchin Monastry Crypt, Brno
- St Warna's Well
- Kelvedon Hatch Rotor SOC and RGHQ
- Porth Hellick Burial Chamber
- Brownlow House
- Mussolini Air-Raid Shelters, Villa Torlonia
- Hopewell Colliery
- Tamar Bridge, Plymouth
- Crumlin Road Gaol Tunnel
- Reigate Road Tunnel
- Snailbeach Mine
- Saint Michael's Cave
- Hay's Level
- Great Siege Tunnels
- Case Romane del Celio
- San Senatore Catacombs
- Priscilla Catacombs
- Domus Romane
- Rome Metro
- Basilica of St Clement
- Tyne & Wear Metro
- Margate Shell Grotto
- Drakelow WW2 Shadow Factory RSG and RGHQ
- Portadown ROC Post
- Snaefell Rotor Radar Station
- The Margate Caves (Vortigern's Cavern)
- Kanne NATO Joint Operations Centre
- Anstruther Rotor Radar Station and Scotland North Zone HQ
- Gros Ouvrage L'Agaisen, Maginot Line
- Gros Ouvrage Sainte-Agnès, Maginot Line
- Vimy Ridge and Tunnels
- Maginot Line Gordolon Gros Ouvrage
- Maginot Line La Barbonnet Gros Ouvrage
- Colinton Tunnel
- Sedan Citadel
- Churchill (Cabinet) War Rooms
- Gros Ouvrage Cap Martin, Maginot Line
- Mynydd Parys (Parys Mountain)
- Marienthal West German Government Bunker
- Cambrai Citadel
- Calais German Naval Bunker/WWII Museum
- Berwyn Tunnel
- Gros Ouvrage Hochwald Maginot Line
- Domqueur Muches
- Petit Ouvrage Bois Karre Maginot Line
- Fort de l'Aisne
- Kent Mining Museum
- Dover Castle AAOR (Casemate Level)
- Abri de Bockange, Maginot Line
- Fan Bay Deep Shelter
- Stone Point ROC Post
- Veryan ROC Post
- Fort Guentrange
- Gros Ouvrage Hackenberg, Maginot Line
- Petit Ouvrage Immerhof, Maginot Line
- Grove Colliery
- Namur Citadel
- Llywernog Mine - Silver Mountain Experience
- Culsh Earth House
- Lochaber Geopark
- Ipswich USW Autovon Telephone Exchange
- Kyiv Metro
- Pechersk Lavra (Cave Monastery) Kyiv
- Blegny Coal Mine
- Wünsdorf Military Base
- Fort Eben-Emael
- Crystal Gypsum Cave
- Wrocław Contemporary Museum (Muzeum Współczesne Wrocław)
- Chislehurst Caves
- Femore Fort
- Biesenthal Stasi Bunker (5005)
- Saint-Sulpice Crypt
- Canal Saint-Martin Tunnel
- Wieliczka Salt Mine
- Blue John Caverns and Mine
- Chelm Chalk Mine
- Opatów Cellars
- Krzemionki Prehistoric Flint Mines
- Bochnia Salt Mine
- Grimes Graves
- Spiennes Neolithic Flint Mines
- Paris Sewer Museum (Musée des Égouts)
- Paris Catacombs
- Ham House Ice House
- Bois des Huit Rues V1 Launch Site
- RAF Digby Sector Operations Room
- Montreuil sur Mer Citadel
- Lezennes Stone Quarry
- Bristol Clifton Rocks Tunnel
- Bethnal Green Underground Station
- Château de Brézé
- Harnekop Nuclear Bunker
- Chapelle Sainte-Radegonde de Chinon
- Rue du Commerce, Souzay-Champigny
- Fort du Roule
- Siarö Fort
- Couriot Coal Mining Museum, St Etienne
- Barons' Cave
- Gävle Coastal Artillery Fort
- Storråberget Fortress, Hemsö
- Havstoudd Battery, Hemsö
- Hawkstone Park
- Castlelaw Hill Fort and Earth House
- Museum of the Scottish Shale Oil Industry
- Llanymynech Limeworks Heritage Area
- Kingswood Ice House and Grotto
- Gatti's Ice House - London Canal Museum
- Lochnell Mine - Museum of Lead Mining
- Wemyss Caves
- Lady Victoria Colliery - National Mining Museum
- Gilmerton Cove
- Blickling Ice House
- Pankstrasse U-Bahn Station and Bunker
- Gesundbrunnen Air-Raid Shelter
- Blochplatz Bunker
- Honister Slate Mine
- Nenthead Mines
- Killhope Lead Mining Museum
- Humboldthain Flak Tower
- High Elms Ice House
- Mary King's Close
- Great Orme Mines
- Broch of Gurness
- Blisworth Canal Tunnel
- Maastricht Casemates
- Falkirk Canal Tunnel
- Hellfire Caves
- Northern St Pietersberg Quarry and Vault
- Hexham Abbey Crypt
- Maison du Fontainier
- Parc des Buttes-Chaumont
- Père Lachaise Cemetery
- Golgotha Tunnel
- Archaeological Crypt of Notre Dame
- Wedel Auxiliary Hospital Bunker
- National Coal Mining Museum for England
- Tar Tunnel
- Grassington Moor Lead Mines
- Arholma Battery
- Hanbury Hall Ice House
- Acomb York ROC Group HQ
- Wilhemsburg Flak Tower Hamburg
- Steintorwall Bunker, Hamburg Central Station
- Old Elbe Tunnel, Hamburg
- Snobs' Tunnel, Hanbury Hall
- Dover Castle Medical Dressing Station (Annexe Level)
- Arras Citadel
- Arras Boves
- Ronville Tunnels (Carrière Wellington)
- La Coupole
- Eperlecques V2 Bunker
- Coombe Conduit
- The Nursemaids' Tunnel
- The Grand Redoubt
- Fort Amherst
- Kensal Green Cemetery and Catacombs
- Verdun Citadel
- Fort Vaux
- Fort Douaumont
- Bock Casemates
- Ram Hill Colliery
- The Grand Shaft
- Raschpëtzer Qanat
- Strombierg Gypsum Mines
- Pétrusse Casemates
- Saint Quirin Chapel
- Rumelange Mining Museum
- Zonneberg Quarry
- Treak Cliff Cavern
- Rijckholt Neolithic Flint Mine
- RAF Laarbruch and Museum
- Wheal Martyn China Clay Works
- Geevor Tin Mine
- Standedge Tunnels
- Broadway ROC Post
- East Pool Mine
- Levant Mine
- Porthcurno Underground Telegraph Station
- King Edward Mine Museum
- Halliggye Fogou
- RAF Drytree
- Odessa Catacombs
- Hindhead Road Tunnel
- Brunkebergstunneln
- Stockholm Metro (Tunnelbana)
- Ramsgate Air Raid Shelter And Scenic Railway
- Greys Court Ice House
- Manchester Science and Industry Museum
- Alderley Edge Mines
- Hughenden Manor Ice House
- Goodluck Lead Mine
- Coleshill Replica Operational Base
- Stockport Air Raid Shelters Chestergate
- Millennium Seed Bank
- Tessin Naval Command Bunker
- Tunnellers' Memorial, Givenchy-lès-la-Bassée
- Casemate Esch, Maginot Line
- Abri de Hatten, Maginot Line
- Ouvrage Four-à-Chaux, Maginot Line
- Fort Schoenenbourg, Maginot Line
- Bitche Citadel
- Caverne du Dragon
- Jersey War Tunnels (Ho8)
- Strongpoint Corbiere, Jersey
- Battery Moltke, Jersey
- La Mare Mill Resistance Nest , Jersey
- La Hougue Bie Neolithic Passage Grave
- Sherborne House Ice House
- Hartmannswillerkopf Trench System
- Western Approaches Headquarters
- Battery Lothringen and Command Post
- Verclut Point Casemate, Jersey
- La Hougue Bie Command Bunker
- Hastings West Hill Cliff Railway
- Brighton Police Cells Museum
- Dark Arch, Parlington Hall
- Newhaven Fort
- RAF Bentley Priory Bunker and Museum
- St Clements Caves
- Queensway Road Tunnel
- Victoria Tunnel
- Royston Cave
- Holy Austin Rock Houses, Kinver Edge
- George Vaults Rochester
- SKF Underground Factory Gothenburg
- Säve Airfield Underground Hangar
- White Scar Cave
- Beer Quarry Caves
- Great Masson Cavern
- Great Rutland Cavern / Nestor Mine
- Smoo Cave
- Bohus Fortress, Kungälv
- Hammarkullen Tram Stop, Gothenburg
- Oscar II Fort Gothenburg
- Speedwell Cavern
- Peak Cavern / Devil's Arse
- Cheddar Caves
- Limpsfield School Air Raid Shelters
- Kelly Mine
- George and Charlotte Copper Mine
- Exeter Underground Passages
- Berlinertor Bunker, Hamburg
- Kaufmann Bunker, Hamburg
- Złoty Stok Gold Mine
- Fort Srebrna Góra
- Nowa Ruda Coal Mine
- Hanička Artillery Fort
- Josefov Fortress
- Dobrošov Artillery Fort
- Bouda Artillery Fortress
- Hurka Fort
- Klodzko Cellars
- Rzeczka - Sztolnie Walimskie (Project Riese)
- Osówka Underground City (Project Riese)
- Książ Castle (Zamek Książ)
- Complex Włodarz, Project Riese
- Die Klocke Ludwikowice Kłodzkie
- Woolwich Foot Tunnel
- Highgate Cemetery
- Greenwich Foot Tunnel
- Kutna Hora Silver Mine
- Prague Metro
- Sedlec Ossuary
- Prague Kolektory
- Janska Underground Factory and Fuel Store
- Bubeneč Sewage Works
- Sloup Castle
- Jalta Hotel Prague
- Harecastle Tunnel, Trent and Mersey Canal
- Calke Abbey Gardeners' Tunnel
- Creswell Crags
- Hack Green Rotor Radar Station and RGHQ
- Darnley Mausoleum
- Wookey Hole
- Cardiff Castle Air Raid Shelters
- Coventry Cathedral Crypts
- St Matthews School Air Raid Shelter
- South Foreland RHQ Deep Shelter
- Lee Ice House
- Stump Cross Cavern
- Skirwith Cave
- Pooles Cavern
- Kents Cavern
- Marble Arch Caves
- Ingleborough Cave
- Dan-Yr-Ogof Caves
- Watermouth Caves
- Mother Shiptons Cave
