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View of monastic dwellings in caves (troglodyte dwelling) at Goreme Open Air Museum, Goreme, Cappadocia, Turkey, Europe
Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia
Longboats moored in creek amid rain forest, while tourists visit Clearwater Cave, Mulu National Park, Sarawak, island of Borneo, Malaysia
Rock drawings of Thamudic origin, relating to ancient tribe of Thamud, 3rd century BC to 2nd century AD, in canyon of Jebel Khazali, south of Rum village, Wadi Rum, Jordan
Panoramic view of the town of Uchisar with its old houses and ancient cave dwellings in the volcanic tufa, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Panoramic view of ancient cave dwellings in the volcanic tufa formations, Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Tourists in a rowing boat entering the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Volcanic cone with plume of smoke of Mount Mayon, 2462m, and grotto or wayside shrine, Bicol Province, Luzon Island, Philippines, Southeast Asia, Asia
Temple building at Wulong Natural Rock Bridges, UNESCO World Heritage Site, Chongqing Municipality, China, Asia
Icicles formed on the roof of caves at Olkhon Island as the waves enter the cave and freeze at the beginning of winter, Lake Baikal, Irkutsk Oblast, Siberia, Russia, Eurasia
Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America
Limestone cave interior with many stalactites and stalagmites, Drach caves (Cuevas del Drach), Porto Cristo, Mallorca, Balearic Islands, Spain, Mediterranean, Europe
Ornate columns formed by many hanging stalactites and rising stalagmites coalescing, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe
Dragon-shaped rock lit by late afternoon sun, winter, Mossy Cave Trail, Bryce Canyon National Park, Utah, USA
Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe
Temple building at Wulong Natural Rock Bridges, UNESCO World Heritage Site, Chongqing Municipality, China, Asia
Sacred Cenote, Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America
Woman standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Two blacktail prairie dog (Cynomys ludovicianus) sharing something to eat, Wind Cave National Park, South Dakota, United States of America, North America
Peveril Castle and Cave Dale backed by Mam Tor, Castleton, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Torghatten granite mountain with a hole through it, Torget island, Bronnoy, Nordland county, Norway, Scandinavia, Europe
Woman walking steps out of a ice cave in Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Dragon-shaped rock lit by late afternoon sun, winter, Mossy Cave Trail, Bryce Canyon National Park, Utah, USA
Close-up of plant, Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Two blacktail prairie dog (Cynomys ludovicianus) eating, Wind Cave National Park, South Dakota, United States of America, North America
The Sanctuary of Pla de Petracos, site of Neolithic rock paintings, near Castell de Castells, Marina Alta, Alicante province, Spain, Europe
Flooded limestone cave interior with many stalactites and stalagmites and reflections, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe
Environmental information poster about ecosystem of limestone cenotes, Yucatan, Mexico, North America
War Remembrance Monument, Cave-Penney Memorial Cross 1918, Corndon Down, Cherwell, Dartmoor, Devon, England, United Kingdom, Europe
Tourist framed in the frozen mouth of ice cave, with icicles formed on roof of caves at Olkhon Island as the waves freeze in winter, Lake Baikal, Irkutsk Oblast, Siberia, Russia, Eurasia
Tourists walking in the ice grotto inside Rhone Glacier, Gletsch, Canton of Valais, Switzerland, Europe
Lush green landscape with rocky cliffs and a clear blue sky, featuring a natural cave entrance and footpath at Malham Cove, Yorkshire, England, United Kingdom, Europe
Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America
Tourist framed in the frozen mouth of ice cave, with icicles formed on roof of caves at Olkhon Island as the waves freeze in winter, Lake Baikal, Irkutsk Oblast, Siberia, Russia, Eurasia
Man standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Desert cottontail (Sylvilagus auduboni), Wind Cave National Park, South Dakota, United States of America, North America
Cave coral (Tubastrea sp.) (Dendrophyllidae) polyps extended and feeding at night, Queensland, Australia, Pacific
Ajanta Cave complex, Buddhist Temples carved into solid rock dating from the 5th Century BC, Ajanta, Maharastra, India
Woman standing in an Ice cave in the Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Woman standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Echidna Chasm, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific