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Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

A woman emerges from a tunnel leading to the rock-hewn church of Bet Amanuel, in Lalibela, Ethiopia, Africa

Incredible geology at Stair Hole near to Lulworth Cove on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Incredible geology at Stair Hole near to Lulworth Cove on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

People swimming in Cenote Zaci, carboniferous limestone swallow hole pool, Valladolid, Yucatan, Mexico, North America

Double rainbow with bear grass in foreground, Hole in the Wall campground, Glacier National Park, Montana, United States of America (U.S.A.), North America

Poulnabrone Dolmen (Poll na mBron) (Hole of Sorrows), a Neolithic portal tomb probably dating from between 4200 to 2900 BC, Burren, County Clare, Munster, Republic of Ireland, Europe

Torghatten granite mountain with a hole through it, Torget island, Bronnoy, Nordland county, Norway, Scandinavia, Europe

Dead juniper tree frames Ear of the Wind Arch, Monument Valley Navajo Tribal Park, Utah, United States of America, North America

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Las Serenitas, wind and wave erosion sculptures, Cabo Pulmo, UNESCO World Heritage Site, Baja California, Mexico, North America

Looking towards Ravenscar from Boggle Hole, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Kasha-Katuwe Tent Rock National Monument, ladder leading to ancient cave dwelling, New Mexico, United States of America, North America

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Boggle Hole and Robin Hood's Bay on a sunny winter's day, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Kasha-Katuwe Tent Rock National Monument, ladder leading to ancient cave dwelling, New Mexico, United States of America, North America

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Boggle Hole and Robin Hood's Bay on a sunny winter's day, Yorkshire, England, United Kingdom, Europe

Dali's Hole at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Detail of wind and water erosion in the sandstone cliffs of the King George River, Koolama Bay, Kimberley, Western Australia, Australia, Pacific

Stair Hole at Lulworth Cove on Dorset's Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Natural stone arch and open grotto framed by turquoise sea, Otranto, Lecce province, Salento, Apulia, Italy, Europe

Sarakiniko volcanic rock formations at sunset, island of Milos, Cyclades, Greek Islands, Greece, Europe

A small flooded sink hole in the Salar de Atacama, Los Flamencos National Reserve, Chile, South America

The famous Eye Hole cave at Pfeiffer Beach, Big Sur, California, United States of America, North America

Strangely shaped granite rocks along a trail in Constellation Park called Hole in the Wall, Prescott, Arizona, United States of America, North America

Aerial view of the open grotto known as Grotta Sfondata on cliffs along the coastline, Otranto, Lecce, Salento, Apulia, Italy, Europe

A granite rock formation along the Hole in the Wall Trail in Constellation Park in Prescott giving the trail its name, Arizona, United States of America, North America

Detail of wind and water erosion in the sandstone cliffs of the King George River, Koolama Bay, Kimberley, Western Australia, Australia, Pacific

Inside ice cave under the Vatnajokull Glacier, with cave guide looking up to hole in cave roof, near Jokulsarlon, South Iceland, Polar Regions

Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe

Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe

An iceberg melting in Suspiros Bay off Joinville Island just off the Antarctic Peninsular. The peninsular is one of the fastest warming places on the planet.

Mount Walker in Paradise Bay off Graham Land on the Antarctic Peninsular. the Peninsular is one of the most rapidly warming places on the planet.

A boulder of millstone grit on Ilkley moor with a perfect circular hole probably formed by a large inclusion weathered out of the bedrock, West Yorkshire, England, United Kingdom, Europe

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

A boulder of millstone grit on Ilkley moor with a perfect circular hole probably formed by a large inclusion weathered out of the bedrock, West Yorkshire, England, United Kingdom, Europe

A boulder of millstone grit on Ilkley moor with a perfect circular hole probably formed by a large inclusion weathered out of the bedrock, West Yorkshire, England, United Kingdom, Europe

A frozen Stickle Tarn with crack patterns in the ice, above the Langdale valley with Pavey Ark in the background, Lake District, Cumbria, England, United Kingdom, Europe

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

Bank Vole (Clethrionomys glareolus) running out of hole wide angle lens showing hole coming from. Argyll, Scotland, UK

Bank Vole (Clethrionomys glareolus) coming out of a hole turning head to right. Hole is in an old wall with moss on the rocks. Argyll, Scotland

Views of the Jougla Point, Antarctica. Jougla Point is located in Port Lockroy at the western end of Wiencke Island

Brown algae, Sargassum horneri and Undaria pinnatifida, Chusan, Ulleungdo, South Korea (East Sea or Sea of Japan).