Doug Perrine / Molten lava lake in Halemaumau Crater, a pit crater in the summit caldera of Kilauea Volcano, Hawaii Volcanoes National Park, Hawaii.
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Guy Edwardes / Quilota Crater Lake, Cotopaxi Province, Ecuador, September 2010.
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Mike Wilkes / Burchell's zebra (Equus quagga burchellii) walking in single file, Ngorongoro Crater,Tanzania
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Mark MacEwen / Lioness (Panthera leo) feeding on carcass, Ngorongoro Crater, Tanzania, Africa.
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Floris van Breugel / Colorful layers of rock on the inside of Mount St Helens' crater, seen from the rim. Washington, USA. May 2013
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D. Parer & E. Parer-Cook / Volcanic caldera, Daphne Island, Galapagos Islands, Ecuador
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Jack Dykinga / Sunset Crater National Monument with dawn light on the San Francisco Peaks over fields of flowering Prairie sunflowers (Helianthus petiolaris) Arizona
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Jack Dykinga / Sunflower flower (Helianthus petiolaris) at Sunset Crater National Monument, Arizona
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Orsolya Haarberg / Large rock in the Hverfjall crater, Iceland, March 2011
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Erlend Haarberg / Hverfjall crater at night, Myvatn, Iceland, March 2011
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Erlend Haarberg / Ljotipollur crater lake, Fjallabakka Nature Reserve, Iceland, August 2010
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Erlend Haarberg / Hverfjall Volcano crater, Myvatn, Iceland, May 2010
