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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

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

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

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

Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Shrine at entrance to levada tunnel (aqueduct) around Rabacal, Paul da Serra plateau, Madeira island, Atlantic Ocean, Portugal

Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Antelope canyon, sandstone slot canyon formed by wind and water, lower antelope canyon, page, arizona, usa

The Fouguo, an ancient underground tunnel found, Carn Euny, a well preserved Iron Age settlement, near Sancreed, Cornwall, England, United Kingdom, Europe

Unesco World Heritage Site, the Mayan ruins of Uxmal, Yucatan, Mexico, Central America, view through a stone tunnel to ancient ruins with open sky in the background, Central America

Underground escape tunnel made of old natural stones on the Rieseneck hunting estate, Kleineutersdorf, Thuringia, Germany, Europe

Tunnel dug into the rock to the Upper Forttress, Franzensfeste or Fortezza village, Eisacktal valley, Southern Tyrol, Italy, Europe,

Street and tunnel, Gorges de la Nesque, Vaucluse, Provence-Alpes-Cote d'Azur, Southern France, France, Europe

Sandstone cave above the pilgrimage shrine of Our Lady of the Rock in Aachtobel Nature Reserve, Lake Constance District, Baden-Wuerttemberg, Germany, Europe