Hikers pass by a Gentoo Penguin (Pygoscelis papua) in the Pleneau Bay area on the Antarctic Peninsula, Antarctica.

Iceberg, Paradise Harbor, Antarctic Peninsula, Antarctica.

Three Gentoo Penguins (Pygoscelis papua), Cierva Cove, Antarctic Peninsula, Antarctica.

Passengers from the Akademik Shokalskiy photograph a lone emperor penguin (Aptenodytes forsteri), East Antarctica.

Adélie penguins (Pygoscelis adeliae) in a blizzard, East Antarctica. Australasian Antarctic Expedition.

Brett Miller is belayed by Sabina Allemann as he is climbing frozen Kinshi Falls in Sounkyo Gorge, Daisetsuzan National Park, Hokkaido, Japan

New Zealand, Otago, Westland Tai Poutini National Park. Climbers, Sabina Allemann and Damien Gildea crossing the Fox Glacier neve on snowshoes.

New Zealand, South Island, Otago. Dawn light on the Harris mountains.

New Zealand, Otago, Wye Creek basin. Ice climbers, Zac Trembath-Pitham and Mark James crampon past a chandelier of blue ice.

Hiking through the snow, Pisa Range, Otago, New Zealand.

Approach to Drygalski Fjord, South Georgia Island.

Pam Weiss and her dog Shadow enjoying a perfect March day, Portage Glacier, Chugach National Forest, Alaska.

At the end of a long day in the mountains, a tired climbing team snuggles into a snow hole as the sun drops below the horizon.

New Zealand, South Island, Otago. Karen Vejsbjerg enjoys a rest after a day spent constructing an igloo on a wilderness medical course.

Iceberg detail, Antarctic Peninsula

McBride Inlet, Glacier Bay National Park, Alaska, USA.

Ice climbing at Wye Creek, New Zealand

Whaler’s Bay, Deception Island, Antarctica