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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

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

Hawthorn tree near the Hole of Horcum, North Yorkshire Moors, Yorkshire, England, United Kingdom, Europe

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

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

Mountain bluebird (Sialia currucoides) pair at their nest, Yellowstone National Park, Wyoming, United States of America, North America

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

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

Exterior of Nobska Point Lighthouse, Woods Hole, Cape Cod, Massachusetts, United States of America (USA), North America

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

Kayakers on the beach at Football Hole near Low Newton-by-the-Sea, Northumberland, 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

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

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

Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

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

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

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

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.

Snorkelers on the surface of a blue hole. Virgin Blue Hole dive site, Palau, Micronesia, Pacific Ocean. More info: Blue holes such as this are submerged limestone sink holes.

A barrier surrounding a hole in the pavement, Ambleside, Lake District, Cumbria, England, United Kingdom, Europe

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

Small German traditional Berliner Pfannkuchen, a donut without hole filled with jam. Traditional served during carnival

Blue tit (Cyanistes caeruleus) looking out of the entrance hole of the breeding cavity, Moenchbruch nature reserve, Moerfelden, Hesse, Germany, Europe

Scuba divers in the Great Blue Hole dive site on the Belize Barrier Reef. This site was made famous by Jacques Cousteau, who declared it one of the top five scuba diving sites in the world, Belize

Scuba divers in the Great Blue Hole dive site on the Belize Barrier Reef. This site was made famous by Jacques Cousteau, who declared it one of the top five scuba diving sites in the world, Belize

Travellers explore New Zealand's famous Franz Josef Glacier. Blue Ice, deep crevasses, caves and tunnels mark the ever changing ice; West Coast, New Zealand

Old Irish castle ruins in a green field with the setting sun coming through the window hole; Clonlarra, County Clare, Ireland

Golfers On Golf Course, Kona Country Club, Kailua Kona, Island Of Hawaii, Hawaii, United States Of America