Tunnels
- Oare Tunnel
- Castle Coole
- Tunnels Beaches, Ilfracombe
- Copenhagen Metro
- TAT-1 Terminal at Gallanach, Oban
- Alderney Water Lane Ho5 Fuel Store And Power Station
- South Molton Railway Tunnel
- Dudley Canal Tunnel
- Cruachan Power Station - The Hollow Mountain
- National Library of Wales - ARP Tunnel
- Foulridge Canal Tunnel
- Øresund Link (Øresundsbron)
- Perridge Tunnel
- Tiergarten 'Germania' Tunnels
- Thames Tunnel and Brunel Museum
- Hyde Park Corner Underground Station
- Highgate Railway Tunnels
- Lagan Weir Tunnel
- London Power Tunnels phase 1
- Holme Hall Foot Tunnel
- Fort Purbrook
- Williamson's Tunnels
- Montreuil-sur-Mer German Barracks
- Fort Southwick
- Norwood Canal Tunnel
- Portsdown Oil Fuel Depot
- Crumlin Road Gaol Tunnel
- Reigate Road Tunnel
- Great North Road Tunnel
- Kingswood Railway Tunnel
- Tunnels under Tain
- Farleigh Down Tunnel
- Rome Metro
- Tyne & Wear Metro
- Clapham North Deep Shelter
- Camden Catacombs and Horse Tunnels
- Lake Nemi Drain
- Sapperton Canal Tunnel
- Portway number 1 Tunnel
- Portway number 2 Tunnel
- Lyme Regis Thistloe Hill Tunnel
- UKPN and Gas Utilities Tunnel, Surbiton
- Roedean School Tunnel
- Tyler Hill Railway Tunnel
- Hayward's Heath Railway Tunnel & Folly Hill Cutting
- Pegwell Bay Seaweed Tunnel
- Mailbox Tunnel
- Marienthal West German Government Bunker
- Berwyn Tunnel
- Crystal Palace Subway
- Thames Tideway
- Oranienplatz Ghost Station, Air-Raid Shelter and Berlin Wall
- The Lochaber Water Power Scheme
- Porthgain Quarry Tramway Tunnel
- Tower Subway
- Kyiv Metro
- Halberstadt Tunnel Complex
- Gibraltar Europa Point Rock Radio Station
- Canal Saint-Martin Tunnel
- Dee Water Tunnel
- Saint Martin Metro Station
- Castel Vendon Battery
- Westdown (Drapers Field) Air-Raid Shelter
- Stratford Tunnel Air-Raid Shelter
- Gainsborough Bridge Air-Raid Shelter
- Bodleian Library Tunnel and Underground Bookstore (Gladstone Link)
- Claygate War Office TBM Testing Ground
- Rue du Commerce, Souzay-Champigny
- Scotland Street Tunnel
- Tregarth Tunnel
- Highgate Archway 'Tunnel'
- Offham Funicular Railway Tunnels
- Caledonian Canal - Allt Sheangain / Torcastle Viaduct
- Catesby Railway Tunnel
- Blisworth Canal Tunnel
- Royal Navy Wee Fea Underground Oil Fuel Tanks
- Well Of The Seven Heads / Tobar Nan Ceann
- Caledonian Canal - Loy Aqueduct
- Maastricht Casemates
- Caledonian Canal - Mount Alexander Aqueduct over Allt Mor
- Cromarty House, Servants' Tunnel
- St Leonard's Bank Railway Tunnel, Edinburgh
- Falkirk Canal Tunnel
- Inchindown Underground Oil Tanks
- Thames Barrier
- Maison du Fontainier
- Place des Fêtes Metro Station
- Petite Ceinture
- Snarestone Canal Tunnel
- Les Sources du Nord (Northern Springs)
- Longbridge Underground Factory and Air-Raid Shelters
- Braunston Canal Tunnel
- Crick Canal Tunnel
- Tar Tunnel
- Prospect Railway Tunnel
- Brunswick Tunnel Air Raid Shelter
- Wymering Air-Raid Shelter
- London Road (Cliffdale) Air-Raid Shelter
- Terlingham Water Tunnel
- Old Elbe Tunnel, Hamburg
- Snobs' Tunnel, Hanbury Hall
- The Nursemaids' Tunnel
- Raschpëtzer Qanat
- Walton-on-the-Hill Tunnels
- Pinnock Tunnel
- Lanaye Eben-Emael Tunnel
- Standedge Tunnels
- Porthcurno Underground Telegraph Station
- Hindhead Road Tunnel
- Oxelösund Underground Oil-storage Tanks
- Södersjukhuset Underground Hospital
- Brunkebergstunneln
- Citybanan (Stockholm City Line)
- Stockholm Metro (Tunnelbana)
- Katarinaberget Nuclear Shelter
- Jönköping Vaults and Civil Defence Bunker
- Manchester and Salford Junction Canal
- Picc-Vic Underground Railway
- Bourne Park Tunnel
- Tunnellers' Memorial, Givenchy-lès-la-Bassée
- Tilmanstone Aerial Ropeway
- Caverne du Dragon
- Jersey War Tunnels (Ho8)
- Jersey Rations Store Ho2
- Jersey Munitions Store Ho1
- St Helier Flood Relief Holding Tank
- Rain Hall Rock Quarry Branch Canal Tunnels
- 'Waterworks' Munitions Store (Ho4) Jersey
- St Aubin Railway Tunnel and German Fuel Store
- Hastings West Hill Cliff Railway
- Leytonstone - Gants Hill Underground Factory
- Dark Arch, Parlington Hall
- Sidmouth Harbour Railway and Tunnel
- Queensway Road Tunnel
- Canada Dock Tunnel
- Kirkdale Tunnels
- Monks Ferry and Woodside Tunnels
- Victoria Tunnel
- Edge Hill and Waterloo Branch Railway
- Bootle Tunnel
- Pontrhydygroes Deep Adit
- Wapping Tunnel
- Chalmers Tram Tunnel Gothenburg
- Hammarkullen Tram Stop, Gothenburg
- Culver Tunnel
- Lords Railway Tunnels
- Exeter Underground Passages
- Altona Harbour Railway Tunnel (Schellfischtunnel or 'Haddock' Tunnel) Hamburg
- Rzeczka - Sztolnie Walimskie (Project Riese)
- Osówka Underground City (Project Riese)
- Complex Włodarz, Project Riese
- Woolwich Foot Tunnel
- River Tyne Road Tunnels
- Greenwich Foot Tunnel
- Silbury Hill Tunnels
- Dover Docks Underground Fuel Tanks
- Alderney Mannez Quarry Ho1 Munitions Store
- Alderney Essex Hill Ho2 Munitions Store
- Channel Tunnel 1880 Attempt
- Lapal Canal Tunnel
- Alderney Lager Sylt Concentration Camp
- Harecastle Tunnel, Trent and Mersey Canal
- Alderney Water Lane Ho6 Munitions Store
- Calke Abbey Gardeners' Tunnel
- Shrewley Canal Tunnel
- Nordhausen V2 Factory and Dora Concentration Camp
- Newbold Tunnel Oxford Canal
- Liverpool Edge Hill Cutting
- Gatwick Airport Passenger Subway
- Huskisson Goods Tunnel
- Thomas Lane Tunnel
- Greywell Tunnel Basingstoke Canal
- Little Tunnel Basingstoke Canal
- Milwr Tunnel
