In the incredible photo by Marc Szeglat (taken Sept. 12, 2012), we see a surreal-looking ice cave on the Kamchatka Peninsula of Russia. It was formed by a stream flowing from the hot springs associated with the Mutnovsky Volcano. This stream flows beneath glacial ice on the flanks of Mutnovsky. Because glaciers on Kamchatka volcanoes have been melting in recent years, the roof of this cave is now so thin that sunlight penetrates through it, eerily illuminating the icy structures within.

The Kamchatka Peninsula is a 1,250-kilometre (780 mi) peninsula in the Russian Far East, with an area of about 270,000 km2 (100,000 sq mi). It lies between the Pacific Ocean to the east and the Sea of Okhotsk to the west. The Kamchatka peninsula contains the volcanoes of Kamchatka, a UNESCO World Heritage Site. [Source]

This photo was also recently recognized as one of the Earth Science Picture of the Day’s “Best of 2012, Viewer’s Choice”