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Vietnamese man entering tunnel, Chu Chi tunnels, Vietnam, Indochina, Southeast Asia, Asia
South Gate of the ancient city walls, Xi'an, China, Asia
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
A woman emerges from a tunnel leading to the rock-hewn church of Bet Amanuel, in Lalibela, Ethiopia, Africa
The Grand Gallery inside the Great Pyramid of Khufu (Cheops), Giza, UNESCO World Heritage Site, Egypt, North Africa, Africa
The Grand Gallery inside the Great Pyramid of Khufu (Cheops), Giza, UNESCO World Heritage Site, Egypt, North Africa, Africa
Neon Subway sign, Times Square, Manhattan, New York City, United States of America, North America
El Capitan and Half Dome at sunset, from Tunnel View, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Aerial image of entrance to The Channel Tunnel (Chunnel) (Eurotunnel), beneath the English Channel, Kent, England, United Kingdom, Europe
Third Tunnel, dug by North Koreans to invade South Korea, near Panmunjom, Demilitarized Zone (DMZ), South Korea, Asia
Third Tunnel, dug by North Koreans to invade South Korea, near Panmunjom, Demilitarized Zone (DMZ), South Korea, Asia
Booby trap, Cu Chi Tunnels, Ho Chi Minh City (Saigon), Vietnam, Indochina, Southeast Asia, Asia
Blurred motion light trails in a train tunnel under the Huangpu River linking the Bund to Pudong, Shanghai, China, Asia
Yosemite Valley from Tunnel View viewpoint, with El Capitan, a 3000 feet granite monolith on the left, and the Bridalveil Falls on the right, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Country road passing through a tunnel of colourful autumnal beech trees, Dorset, England, United Kingdom, Europe
Climbers approaching the Tunnel to the Aiguile du Midi, 3842m, Graian Alps, Chamonix, Haute Savoie, French Alps, France, Europe
The Antim Monastery, built between 1713 and 1715 by Saint Antim Ivireanu, Bucharest, Romania, Europe
The Antim Monastery, built between 1713 and 1715 by Saint Antim Ivireanu, Bucharest, Romania, Europe
Art Deco Wooden Escalator, Pedestrian Tunnel of St. Anna under the River Scheldt, Antwerp, Belgium, Europe
Path under red torii in Fushimi Inari shrine, Kyoto, Japan, Asia
The Dark Hedges, Armoy, County Antrim, Northern Ireland, United Kingdom, Europe
Flam Railway, Flam, Sogn og Fjordane, Norway, Scandinavia, Europe
Barragem do Alqueva, Rio Guadiana river, Alqueva dam hydroelectric power, Moura, Portugal, Europe
Waterfall falling from a Slate Cavern tunnel entrance, Dinorwig or Dinorwic Quarry, Eryri or Snowdonia National Park, North Wales, UK
Signs of the Civil War in Sant Felip Neri Square, Gothic Quarter, Barcelona, Catalonia, Spain, Europe
Close-up of plant, Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Tunnel of Torii gates, Fushimi Inari Taisha Shrine, Kyoto, Japan, Asia
Lit underpass at Kings Cross station, London, England, United Kingdom, Europe
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Tourist exploring the tunnels at the Greek ruins, Eurialo Casle (Castello Eurialo), Syracuse (Siracusa), Sicily, Italy, Europe
Path under red torii in Fushimi Inari shrine, Kyoto, Japan, Asia
Path under red torii in Fushimi Inari shrine, Kyoto, Japan, Asia
The Himalayan Queen toy train approaching a tunnel, on the Kalka to Shimla Railway, UNESCO World Heritage Site, Northwest India, Asia
Underground Tourist Route, Rzeszow, Poland, Europe
Path under red torii in Fushimi Inari shrine, Kyoto, Japan, Asia
Dirt road winding through a tree tunnel in fall, Bishop, California, United States of America, North America
Torii tunnel, Fushimi-inari shrine, Kyoto, Japan, Asia
Tourist on viewing platform, Aiguille du Midi, Chamonix-Mont-Blanc, French Alps, France, Europe
Apple tree tunnel Heale House and gardens, Middle Woodford, Salisbury, Wiltshire, England, UK
The Bund Sightseeing Tunnel under the Hangpu River, Shanghai, China, Asia
Snow clearing equipment at a tunnel through sunlit red rock in winter, Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America
The Mont Blanc Tunnel runs through the highest mountain in the Alps, connecting Courmayeur, Italy, and Chamonix-Mont-Blanc, France, Europe
Underground Tourist Route, Rzeszow, Poland, Europe
Pedestrian Tunnel of St. Anna under the River Scheldt, Antwerp, Belgium, Europe
El Capitan and Bridalveil Falls frame Half Dome and Clouds Rest, Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Ice cave beneath a glacier, Iceland, Polar Regions
Tank, Cu Chi Tunnels, Ho Chi Minh City (Saigon), Vietnam, Indochina, Southeast Asia, Asia
The town of Orchisar, showing the old tunneled houses dug into the volcanic rock, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Man standing at entrance to an ice cave beneath a glacier, Iceland, Polar Regions
Colourful sunrise above Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Ornamental tunnel through a mountain leading to the Guandu Temple, Guandu, Taipeh, Taiwan, Asia
Rubber sandals made from tyres, Cu Chi Tunnels, Ho Chi Minh City (Saigon), Vietnam, Indochina, Southeast Asia, Asia
Funival train, Val D'Isere, Savoie, French Alps, France, Europe
Odaiba, Rainbow Bridge, Tokyo, Japan
Underground Tourist Route, Rzeszow, Poland, Europe
Railway Station, Kuala Lumpur, Malaysia
Climbers approaching the Tunnel to the Aiguile du Midi, 3842m, Graian Alps, Chamonix, Haute Savoie, French Alps, France, Europe
Alcazaba, Malaga, Andalucia, Spain, Europe
Taxi, Cross-Harbour Tunnel, Hong Kong, China, Asia
Colourful illuminated interior of the Roughcastle Tunnel at night, Edinburgh and Glasgow Union Canal, Falkirk, Scotland, United Kingdom, Europe
El Capitan rising above Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
The Subway, Zion National Park, Utah, United States of America, North America
Girl and women in black chadors, Grand Bazaar, Isfahan, Iran, Middle East
Knowth, UNESCO World Heritage Site, County Meath, Leinster, Republic of Ireland, Europe
Sunrise over El Capitan and Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Close up of Taxi sign on car roof in tunnel, Shanghai, China, Asia
Tourist exploring the tunnels at the Greek ruins, Eurialo Casle (Castello Eurialo), Syracuse (Siracusa), Sicily, Italy, Europe
Underground train, Milan, Lombardy, Italy, Europe
Majestic view of Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Bunker, Cu Chi Tunnels, Ho Chi Minh City (Saigon), Vietnam, Indochina, Southeast Asia, Asia
Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Yosemite Valley and Bridalveil Fall from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Third Tunnel Statue, site of Third Infiltration Tunnel, Demilitarised Zone (DMZ) between North and South Korea, Asia
Yosemite Valley from Tunnel View, UNESCO World Heritage Site, California, United States of America, North America
Bridalveil Falls and Half Dome at sunrise from Tunnel View, Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America
Exiting the Subway Zion National Park, Utah, United States of America, North America
Knowth, UNESCO World Heritage Site, County Meath, Leinster, Republic of Ireland, Europe
Tunnel Creek, the Kimberleys, Western Australia, Australia, Pacific
Tunnel Creek, the Kimberleys, Western Australia, Australia, Pacific
Passau, Bavaria, Germany, Europe
The 16th century East Port Gate, Delft, Holland, Europe
Famous tunnels of Guanajuato, a UNESCO World Heritage Site, Guanajuato State, Mexico, North America
Odaiba, Rainbow Bridge, Tokyo, Japan
Walking Fairyland Bridge, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia
Tram under the trees, Bordeaux, Gironde, Aquitaine, France, Europe
Couple walking into the light, York tunnel, York, England, United Kingdom, Europe
Vibrant soft corals, Dendronephthya sp., thrive among the islands of Raja Ampat, Indonesia.
Jajce Fortress, Bosnia and Herzegovina, Europe
A road runs through the Dark Hedges tree tunnel at sunrise in Northern Ireland, United Kingdom, Europe
Greenwich Foot Tunnel south entrance and Cutty Sark British Clipper Ship, Greenwich, London, England, United Kingdom, Europe
Greenwich Foot Tunnel, interior, Greenwich, London, England, United Kingdom, Europe
Soviet-era nuclear bunker, central Tirana, Albania, Europe
Tuzluca salt mine used for halotherapy, Tuzluca, Turkey, Asia Minor, Asia
East Zion National Park where Highway 9 winds between the Zion-Mount Carmel Tunnel and Checkerboard Mesa, Utah, United States of America
Shrine at entrance to levada tunnel (aqueduct) around Rabacal, Paul da Serra plateau, Madeira island, Atlantic Ocean, Portugal
Tunnel, Funchal, Madeira island, Atlantic Ocean, Portugal
The west entrance of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The Red Wall of sandstone east of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
A curve in the North Kaibab Trail between Coconino Overlook and the Supai Tunnel Rest Area, Grand Canyon, Arizona, United States of America