Mountaineers on 26,360-foot Gasherbrum II at sunset.
Gasherbrum II, Karakoram Range, Pakistan.
CORY RICHARDS/National Geographic Creative
A mountaineer turns the camera on himself minutes after digging out from an avalanche on Gasherbrum II.
Karakoram Range, Pakistan.
A polar bear stands at the water's edge on Rudolph Island.
Franz Josef Land, Russia.
Upward plank pose or Purvottanasana.
Tonsai, Krabi, Thailand.
A woman climbing in the Khumbu Region of the Himalaya Mountains.
Khumbu Region, Himalaya Mountains, Nepal.
A portrait of Nepali children in the Kingdom of Mustang, Nepal.
Climbers and scientists follow a trail above the Kali Gandaki River.
Nuptse Mountain and the west shoulder of Mount Everest at sunset.
Murres perching on an iceberg off Hooker Island.
A scientist scales a fragile rock face to reach 800-year-old caves.
Expedition team members trek over blue glacial ice.
Queen Maud Land, Antarctica.
An expedition team member hauls himself up Bertha's Tower in remote Queen Maud Land.
Dusk falls over the temples and homes of Tsarang.
Tsarang, Mustang, Nepal.
A scientist hoists himself up at a Mustang cave entrance.
A walrus swims underwater off Hooker Island.
An ice climber on mixed rock and ice on the Stanley Headwall, Canadian Rockies, Canada.
Rocky Mountains, Canada.
Walruses swimming underwater off Hooker Island.
Below Rubini Rock, a polar bear approaches a remote camera.
Little auks fly elliptical circuits above Rubini Rock.
A polar bear stands on a cliff and roars on Rudolph Island.
Close up portrait of an African elephant.
Murchison Falls, Uganda.
Walruses swim underwater off Hooker Island.
A rock climber climbing steep granite in the Needles, California.
Downward facing dog pose or Adho Mukha Shvanasana meets upward facing cat.
A woman from the Russian Academy of Sciences samples a water column to monitor the diversity of copepods.
The wreckage of an Ilyushin-14T cargo plane at an old Soviet weather research outpost called Krenkel Station.
Walruses approach swimming in the Arctic Ocean off Hooker Island.
Arctic terns flying above the ocean near Rudolph Island.
A Bon monk holds a mala, or Tibetan rosary, used to keep track of prayers and mantras during a religious ceremony.
Lubra, Mustang, Nepal.
An Everest climber descends through the Khumbu Icefall with a fixed rope.
Mount Everest, Nepal.
A polar bear looks for little auks and eggs on a small island.
A polar bear on Rudolph Island.
A walrus with his nose in the air off Hooker Island.
A base jumper leaps off the Mushroom on the North Face of the Eiger in the Bernese Oberland of the Swiss Alps.
Eiger Mountain, Switzerland.
A climber rappels into a mortuary cave.
An African elephant near the Nile River.
Murchison Falls, Uganda.
A walrus relaxes off Cape Flora.
Walrus swimming off Hooker Island.
A human skull is unearthed from a burial crypt.
Samdzong, Mustang, Nepal.
An African fish eagle alights on the Nile River bathed in sunlight at sunset.
The broken remains of a Kabum in Dhabrang Jang Cave near Chuksang.
Chuksang, Mustang, Nepal.
The steep face of Rubini Rock supports thousands of nesting pairs of seabirds.
A young Quechua girl in the Santa Cruz Valley of the Cordillera Blanca, Peru.
Cordillera Blanca, Peru.
Explorers stand atop summit on Mabel Island.
Josef Land, Russia.
A polar bear approaches remote camera and knocks it over with his nose.
Rugged cliffs of Mabel Island.
An iceberg off Cape Flora.
Ice and snow covered rugged cliffs.
An explorer on the crest of Wiener Neustadt Island.
The rear flippers of a walrus off Hooker Island.
Icebergs and rugged cliffs off Tegetthoff Island.
Walruses approach an expedition boat from a haulout on Hooker Island.
Sherpas haul gear in the Western Cwm of Mount Everest.
A scientist tags a seabird on Cape Flora.
A scientist takes microbial samples from a freshwater lake on Bell Island.
A polar bear swims in the ocean near an island in Franz Josef Land.
A bird diving in the Arctic Ocean off Cape Flora.
Little auks and other seabirds and icebergs in the Arctic Ocean.
An iceberg off Jackson Island.
A mountaineer after a grade 4 avalanche.
Gasherbrum, Himalaya Mountains, Nepal.
Arctic terns take flight near Rudolf Island, the northernmost point in Franz Josef Land.
A flock of African skimmer birds fly over Murchison Falls.
A Galapagos sea lion frolics just beneath the ocean surface.
Galapagos Islands, Ecuador.
A woman doing tree pose or Vrksasana.
Mountaineers trek across the Antarctic ice cap for a circumnavigation of the Wohlthat Mountains.
A remote camera captures a polar bear foraging for little auks.
Rugged cliffs on Tegetthoff Island.
A man climbing a steep limestone face in the Crimea region of Ukraine.
A Tibetan Buddhist lama leads his horse through the village of Samdzong.
A Bajo elder of Sampela, spear fishing on the reef.
Sampela, Wakatobi, Sulawesi Island, Indonesia.
A puja ceremony at Everest's Base Camp.
An Ice climber leads a steep climb in the Ghost River Valley, Canadian Rockies.
Rocky Mountains, Alberta, Canada.
A mountaineer climbing a steep ridge.
Karakoram Range, Himalaya Mountains.
Glacier's edge off Cape Flora.
A dramatic sky over Tegetthoff Island.
A scientist explores Wiener Neustadt Island in a snowstorm.
Ice skates abandoned at Krenkel Station on Hayes Island, a Soviet weather research outpost that fell victim to a fire in 2001.
Franz Josef Land , Russia.
Close up of plant cushions on an island in Franz Josef Land.
Birds flying along the cliffs of Cape Flora.
A scientist takes notes during a megatransect of Nansen Island.
Nansen Island, Franz Josef Land, Russia.
A polar bear foraging on Rudolph Island.
A polar bear stands at water's edge on Rudolph Island.
Portrait of a walrus off Hooker Island.
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