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View from below of a man standing in front of the castle of Torre Astura seen through a hole in the wall, Rome province, Tyrrhenian sea, Latium (Lazio), Italy, Europe

Woman ice bathing on a frozen lake at dusk, Jokkmokk, Norrbotten, Swedish Lapland, Sweden, Scandinavia, Europe

The 18th hole on golf course, Fairmont Turnberry Isle Resort and Club, Aventura, Florida, United States of America, North America

A snowflake moray eel (Echidna nebulosa) peeks out from a dark hole on a reef in Komodo National Park, Indonesia.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

The Blue Hole, a popular destination for swimming, caving and cliff jumping, Blue Hole Park, Hamilton Parish, Bermuda, Atlantic, North America

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

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

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

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.

A Spotted Moray Eel (Gymnothorax moringa) displays an open mouth as it protrudes it's head just outside a hole in a coral reef in the Atlantic Ocean off the coast of Key Largo, Florida.

A Rainbow Parrotfish (Scarus guacamaia) pokes it's head out from a hole in the coral reef in the Atlantic Ocean off the coast of Key Largo, Florida.

A Neon Goby (Gobiosoma oceanops) takes a look outside its hole in the live boulder star coral (Montastraea annularis), Key Largo, Florida.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

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

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

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

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

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

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

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

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

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

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

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

Masai Giraffes (Giraffa camelopardalis) next to a watering hole in Tarangire National Park, Manyara Region, Tanzania, East Africa, Africa

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

Steaming volcanic mud pools, Rincon de la Vieja National Park at foot of Rincon Volcano, Gaunacaste, Costa Rica

View of the Sass de Putia through a heart shaped hole at dusk, Passo delle Erbe, Dolomites, South Tyrol, Italy, Europe

Adult pied avocets (Recurvirostra avosetta) feeding at a water hole in Ngorongoro Crater, Tanzania, East Africa, Africa

Bell tower and snowy peaks seen from stone arch, Soglio, Maloja, Bregaglia Valley, Engadine, canton of Graubunden, Switzerland Europe

White rhino (Ceratotherium simum) with calf, Kumasinga water hole, Mkhuze game reserve, KwaZulu-Natal, South Africa, Africa

Harrington Sound, close to the site of the former Devil's Hole sinkhole, Smiths Parish, Bermuda, Atlantic, North America

Harrington Sound, close to the site of the former Devil's Hole sinkhole, Smiths Parish, Bermuda, Atlantic, North America

White rhino (Ceratotherium simum) with calf, Kumasinga water hole, Mkhuze game reserve, KwaZulu-Natal, South Africa, Africa

White rhino (Ceratotherium simum), Kumasinga water hole, Mkhuze game reserve, KwaZulu-Natal, South Africa, Africa

A large iceberg with holes and arches formed in it near Coronation Island, South Orkneys, Antarctica, Polar Regions

Swallow-tailed bee-eater (Merops hirundineus), at nest hole, Kgalagadi Transfrontier Park, South Africa, Africa

African elephant (Loxodonta africana), herd drinking at a watering hole in the Okavango Delta, Botswana, Africa

Mother and calf African elephant (Loxodonta africana), at a watering hole in the Okavango Delta, Botswana, Africa

African elephant (Loxodonta africana) at water hole, Greater Addo National Park, South Africa, Africa

African elephants (Loxodonta africana) at a water hole in Mababe Plain, Chobe National Park, Botswana.

African elephant (Loxodonta africana), herd drinking at a watering hole in the Okavango Delta, Botswana, Africa