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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

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

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

Waterfall from Slate Cavern Tunnel entrance, Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

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

Dirt road winding through a tree tunnel in fall, Bishop, California, United States of America, North America

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

Signs of the Civil War in Sant Felip Neri Square, Gothic Quarter, Barcelona, Catalonia, Spain, Europe

The Mont Blanc Tunnel runs through the highest mountain in the Alps, connecting Courmayeur, Italy, and Chamonix-Mont-Blanc, France, Europe

Close-up of plant, Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

The Himalayan Queen toy train approaching a tunnel, on the Kalka to Shimla Railway, UNESCO World Heritage Site, Northwest India, Asia

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

The town of Orchisar, showing the old tunneled houses dug into the volcanic rock, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Colourful sunrise above Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Climbers approaching the Tunnel to the Aiguile du Midi, 3842m, Graian Alps, Chamonix, Haute Savoie, French Alps, France, 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

Majestic view of Yosemite Valley 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

Yosemite Valley and Bridalveil Fall from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite Valley from Tunnel View, Yosemite National Park, 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

Walking Fairyland Bridge, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

A road runs through the Dark Hedges tree tunnel at sunrise in Northern Ireland, United Kingdom, Europe

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

The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Shoro (Bell Building) and tunnel to Rengeoin Todaimon (Grand East Gate) in Sanjusangendo Temple, Sanjusangendomawari, Kyoto, Honshu, Japan

The remains of a Guard Shack above the Johnson Canyon Railroad Tunnel. The railroad was abandoned in 1959 and is now owned by the Kaibab National Forest of Arizona. No property release needed.

View of Johnson Canyon from above the abandoned Johnson Canyon Railroad Tunnel in the Kaibab National Forest of Arizona.

The south entrance of the historic Johnson Canyon Railroad Tunnel. Constructed in 1881, abandoned in 1959. It's now part of the Kaibab National Forest of Arizona. No property release needed.

The south entrance of the historic Johnson Canyon Railroad Tunnel. Constructed in 1881, abandoned in 1959. It's now part of the Kaibab National Forest of Arizona. No property release needed.

The south entrance of the historic Johnson Canyon Railroad Tunnel. Constructed in 1881, abandoned in 1959. It's now part of the Kaibab National Forest of Arizona. No property release needed.

The north entrance of the historic Johnson Canyon Railroad Tunnel. Constructed in 1881, abandoned in 1959. It's now part of the Kaibab National Forest of Arizona. No property release needed.