Penguins surface near an air hole in Antarctica, captured with a remote underwater camera.
A snow-covered dock at the Lake of Zug in central Switzerland right before sunrise. Photograph Ingo Meckmann
U.S.S. Atka stands off Crater Hill on McMurdo Sound in mid-March; she kept channels open for evacuation of the last summer residents.
Joseph H. Judith was the Captain of the Icebreaker Atka GB3 when this picture was taken in Operation Deepfreeze. Photograph Charles Swithinbank
Polar bear ship- Norway. Photograph by Michael Nolan
Simonos Petras monastery was founded in 1257 more than 800 feet above the Aegean Sea. It is one of 20 monasteries on the steep-sloped Greek peninsula of Mount Athos. Photograph Travis Dove
Photograph Thierry Bornier