David Tipling / Snow petrel (Pagadroma nivea nivea) flying around Iceberg off South Georgia, Southern Ocean January
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Benjamin Olson / Cave at night during polar vortex, Lake Superior, Tettegouche State Park, Minnesota, multiple exposures
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Floris van Breugel / Ice cave melting in Mendenhall Glacier, Juneau, Alaska, USA, August 2014.
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Floris van Breugel / Ice cave with melt water running through, Mendenhall Glacier, Juneau, Alaska, USA, August 2014.
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Olga Kamenskaya / Ice stalagmites / ice spikes formation, Lake Baikal, Siberia, Russia, March.
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Chadden Hunter / Entering the ice caves of Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009
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Chadden Hunter / Person standing infront of long icicles, outside volcanic ice cave, Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009
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Bryan and Cherry Alexander / Icicles at entrance to cave in a small iceberg, Antarctica, 2009.
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Floris van Breugel / A colorful explosion of rocks embedded in three feet of permanent cave ice deep in a lava tube cave (illuminated with a flashlight in the utter darkness.) Lava Beds National Monument, Northern Califor...
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Thomas Lazar / Ice hanging from arch in sea cave carved in soft sandstone cliffs, frozen lake, Squaw Bay, Lake Superior, Apostle Islands National Lakeshore, Wisconsin, USA, February 2009
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Wild Wonders of Europe / Radisics / Ice forming stalagmite structures in Ledena Pecina (an ice cave) inside Obla Glava (Rounded head peak) Durmitor NP, Montenegro, October 2008
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Wild Wonders of Europe / Radisics / Ice formation in Ledena Pecina (an ice cave) inside Obla Glava (Rounded head peak) Durmitor NP, Montenegro, October 2008