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1231-46 - Tiled historical rest area in an underground pedestrian tunnel. Genoa, Liguria, Italy, Europe.
832-401693 - Underground escape tunnel made of old natural stones on the Rieseneck hunting estate, Kleineutersdorf, Thuringia, Germany, Europe
832-399857 - Silhouette of the man in underground tunnel
1178-40799 - Portrait of smiling Indian woman in tunnel
1178-37700 - Carefree Caucasian man skipping in tunnel
1348-2770 - Miners working at Potosi silver mines, Department of Potosi, Bolivia, South America
1348-2871 - Guernsey Underground German Military Hospital from World War Two, Channel Islands, United Kingdom
1116-49244 - Cathedral of San Lorenzo, Lugano, Ticino, Switzerland
1328-4 - One stationary and one underground train in motion, London Tube Station, Clapham Common, Clapham, London, England, United Kingdom, Europe
805-1333 - Illuminated underground karez (water canals) in the oasis town of Turpan, Silk Road, Xinjiang, China, Asia
1116-47084 - Motion Blur Of The Side Of A Train Passing Through A Station, Prague, Czech Republic
1317-32 - Buddha statues in the underground corridors of Htukkanthein temple, Mrauk U, Rakhine, Myanmar (Burma), Asia
1116-45845 - Old Syrian Army Bunker, Golan Heights, Israel
1116-46004 - A Round Opening With Sunlight Viewed From An Underground Tunnel, Harran, Turkey
1116-46006 - Titus' Tunnel Cuts Through The Solid Rock Of The Mountain In Two Places To Provide A Water Channel To Prevent Flooding, Cevlik, Turkey
1116-46005 - Titus' Tunnel Cuts Through The Solid Rock Of The Mountain In Two Places To Provide A Water Channel To Prevent Flooding, Cevlik, Turkey
1116-44388 - Inside The Mamertine Prison, This Metal Grate In The Floor Covers Where The Prisoners Were Lowered Into Their Prison Cell, Rome, Italy
1116-44305 - Tunnels And Caves In The Kaymakli Underground City, Kaymakli, Turkey
1116-44304 - Tunnels And Caves In The Kaymakli Underground City, Kaymakli, Turkey
1116-44389 - Inside The Mamertine Prison, This Metal Grate In The Floor Covers Where The Prisoners Were Lowered Into Their Prison Cell, Rome, Italy
1116-43965 - Long Exposure While Taking Underground Transportaion Giving A Time Warp Feel, Seattle, Washington, United States Of America
1116-43266 - Kaymakli Underground City, Kaymakli, Cappadocia, Turkey
1174-6067 - Curved roof and floor tiles of subway station
1174-5329 - Underground Metro System, Hong Kong, China
1245-1438 - Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
1245-1449 - Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
1116-41491 - Interior trains at the Vaughan Metropolitan Centre subway station on the Yonge-University line, Toronto, Ontario, Canada
1272-15 - A tourist walking through The Underground German Hospital in Guernsey, Channel Islands, United Kingdom, Europe
857-94088 - One lane bridge span mountain lake, distant hills and storm
1265-26 - Tunnel of Salina Turda, well known landmark in Turda, Transylvania, Romania, Europe
1171-259 - Blast chambers at Schoenenbourg Fortress, Bas-Rhin department, France, Europe
1171-258 - Seemingly never ending main tunnel at Schoenenbourg Fortress, Bas-Rhin department, France, Europe
1116-39192 - Service Tunnel Under The Control Room Of The Very Large Telescope Of The European Southern Observatory, Paranal, Antofagasta Region, Chile
746-87043 - Cueva de Los Verdes, volcaninc cave, Lanzarote, Canary Islands, Spain, Europe
857-90836 - Workers exiting tunnel in crane cage, United States of America
857-90837 - TUNNEL WORKERS UNDERGROUND WITH HEAVY EQUIPMENT, United States of America
1178-23393 - Hungary, Budapest, Castle Hill, Cars driving through tunnel, Hungary, Budapest
733-6448 - Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
733-6450 - Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
733-6449 - Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
832-378176 - Artwork in the Underground City walkway system, Underground City, Montréal, Quebec Province, Canada, North America
832-378175 - Artwork in the Underground City walkway system, Underground City, Montréal, Quebec Province, Canada, North America
832-378179 - Artwork in the Underground City walkway system, Underground City, Montréal, Quebec Province, Canada, North America
832-378181 - Artwork in the Underground City walkway system, Underground City, Montréal, Quebec Province, Canada, North America
832-374149 - Man standing in Upper Antelope Canyon near Page, Arizona, USA
832-378177 - Artwork in the Underground City walkway system, Underground City, Montréal, Quebec Province, Canada, North America
832-378173 - People walking in a pedestrian tunnel, Underground City walkway system, Underground City, Montréal, Quebec Province, Canada, North America
832-337338 - Construction work for Porta Alpina, the underground train stop in the Gotthard base tunnel, with driving work truck and a red train of the Matterhorn-Gotthard-Bahn (background), Sedrun, Grisons, Switzerland
832-244264 - Sewage canal, tunnel, pipe, workman, underground, remodelling of the Emscher River, Emscher-Industrial Waste Canal, Wanne-Eickel, Herne, Ruhr Area, North Rhine-Westphalia, Germany, Europe
844-1832 - Underground Tourist Route, Rzeszow, Poland, Europe
844-1833 - Underground Tourist Route, Rzeszow, Poland, Europe
844-1834 - Underground Tourist Route, Rzeszow, Poland, Europe
832-158692 - Illuminated pedestrian tunnel, walkway in the underground city of Montreal, Quebec, Canada, North America
832-157637 - Tunnel dug into the rock to the Upper Forttress, Franzensfeste or Fortezza village, Eisacktal valley, Southern Tyrol, Italy, Europe,
832-140587 - Hallstatt Salt Mine, Empress Christina Stollen gallery, Salzkammergut, Upper Austria, Europe
832-52111 - Alter Elbtunnel, Old Elbe Tunnel, Hamburg, Germany, Europe
832-45138 - Inside Daugbjerg limestone mines near Viborg, Jutland, Denmark, Europe
1113-74892 - The Washington Metro, Washington DC, United States, USA
1113-74895 - The Washington Metro, Washington DC, United States, USA
857-40636 - Cave explorer ascends a knotted rope out above a pool of water in a cave in England called Streaks Pot.
857-40626 - Cave explorer struggles to negotiate a tight squeeze in the entrance of a cave in the White Mountains on the island of Crete.
857-40607 - A cave explorer poses in a tube in a cave in Mulu National Park
857-45385 - Two cave explorers walk through a section of cave tunnel deep in heart of the mountain. At this point in the cave the floor was
857-45379 - Two female cave explorers walk through a tunnel in a cave deep in the Malaysian jungle in Mulu.
857-45380 - Two female cave explorers stop for a rest whilst exploring this delightfully linear tunnel deep in Whiterock (cave).
857-40621 - Katie Dent climbs up a rope in a cave in the White Mountains on Crete.
857-40604 - A cave explorer admires pretty cave formations in Mulu National Park.
857-40631 - Cave explorer forces his way up through a narrowing in the rock in a cave high in the White Mountains on the island of Crete.
857-40609 - Cave explorers add scale to a cave in Mulu National Park
857-40613 - A cave explorer reaches the top of a waterfall underground in New Britain
857-45381 - Two female cave explorers stop for a rest whilst exploring this delightfully linear tunnel deep in Whiterock (cave).
857-40638 - Cave explorer crawls through a low section of cave passage underground in Derbyshire England.
857-40627 - A cave explorer has to remove his helmet in order to pass the tight squeeze in an entrance to a cave in the White Mountains on t
975-1 - The ultra modern vancouver underground Airport Shuttle, whizzes through the tunnel, sleek and vacant of any human activity. Vanocuver, BC, Canada
940-135 - Chalk carving of face in hand-dug tunnel, Hell-Fire Caves, West Wycombe, Buckinghamshire, England, United Kingdom, Europe
940-136 - Chalk carving of face in hand-dug tunnel, Hell-Fire Caves, West Wycombe, Buckinghamshire, England, United Kingdom, Europe
911-6944 - Red light art installation in the entrance tunnel to the underground Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions
911-7199 - The Fouguo, an ancient underground tunnel found, Carn Euny, a well preserved Iron Age settlement, near Sancreed, Cornwall, England, United Kingdom, Europe
911-1208 - A train coming out of a tunnel at an underground station, London, England, United Kingdom, Europe
829-823 - Re-created diamond mining tunnels at the Kimberley Open Mine Museum in Kimberley in South Africa's North-West Province.
806-35 - Underground train, Milan, Lombardy, Italy, Europe
807-17 - Neon Subway sign, Times Square, Manhattan, New York City, United States of America, North America
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