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 woman climbing in the Khumbu Region of the Himalaya Mountains.
Khumbu Region, Himalaya Mountains, Nepal.
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 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.
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.
Murres perching on an iceberg off Hooker Island.
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 polar bear stands on a cliff and roars on Rudolph Island.
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.
The wreckage of an Ilyushin-14T cargo plane at an old Soviet weather research outpost called Krenkel Station.
Below Rubini Rock, a polar bear approaches a remote camera.
Little auks fly elliptical circuits above Rubini Rock.
Walruses approach swimming in the Arctic Ocean off Hooker Island.
Downward facing dog pose or Adho Mukha Shvanasana meets upward facing cat.
Close up portrait of an African elephant.
Murchison Falls, Uganda.
A woman from the Russian Academy of Sciences samples a water column to monitor the diversity of copepods.
Walruses swim underwater off Hooker Island.
A rock climber climbing steep granite in the Needles, California.
Explorers stand atop summit on Mabel Island.
Josef Land, Russia.
A Bon monk holds a mala, or Tibetan rosary, used to keep track of prayers and mantras during a religious ceremony.
Lubra, Mustang, Nepal.
A polar bear looks for little auks and eggs on a small island.
An Everest climber descends through the Khumbu Icefall with a fixed rope.
Mount Everest, Nepal.
Arctic terns flying above the ocean near Rudolph Island.
A walrus relaxes off Cape Flora.
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 polar bear on Rudolph Island.
A walrus with his nose in the air off Hooker Island.
A climber rappels into a mortuary cave.
A human skull is unearthed from a burial crypt.
Samdzong, Mustang, Nepal.
An African elephant near the Nile River.
Murchison Falls, Uganda.
Walrus swimming off Hooker Island.
Icebergs and rugged cliffs off Tegetthoff Island.
The broken remains of a Kabum in Dhabrang Jang Cave near Chuksang.
Chuksang, Mustang, Nepal.
An African fish eagle alights on the Nile River bathed in sunlight at sunset.
Mountaineers trek across the Antarctic ice cap for a circumnavigation of the Wohlthat Mountains.
A young Quechua girl in the Santa Cruz Valley of the Cordillera Blanca, Peru.
Cordillera Blanca, Peru.
The steep face of Rubini Rock supports thousands of nesting pairs of seabirds.
Climbing in the late day sun as Thamserku rises in the background of the Khumbu Valley in the Everest region of Nepal.
A flock of African skimmer birds fly over Murchison Falls.
A scientist takes microbial samples from a freshwater lake on Bell Island.
An iceberg off Cape Flora.
A polar bear approaches remote camera and knocks it over with his nose.
Rugged cliffs of Mabel Island.
Ice and snow covered rugged cliffs.
An explorer on the crest of Wiener Neustadt Island.
A hiker observes a snow storm in the high Cordillera Blanca mountains and Tuqllarahu mountain.
The rear flippers of a walrus off Hooker Island.
Sherpas haul gear in the Western Cwm of Mount Everest.
A mountaineer after a grade 4 avalanche.
Gasherbrum, Himalaya Mountains, Nepal.
A mountaineer climbing a steep ridge.
Karakoram Range, Himalaya Mountains.
A polar bear approaches remote camera and ad tries to eat it.
Walruses approach an expedition boat from a haulout on Hooker Island.
A Bajo elder of Sampela, spear fishing on the reef.
Sampela, Wakatobi, Sulawesi Island, Indonesia.
A scientist tags a seabird on Cape Flora.
A polar bear swims in the ocean near an island in Franz Josef Land.
A bird diving in the Arctic Ocean off Cape Flora.
A Galapagos sea lion frolics just beneath the ocean surface.
Galapagos Islands, Ecuador.
Little auks and other seabirds and icebergs in the Arctic Ocean.
Arctic terns take flight near Rudolf Island, the northernmost point in Franz Josef Land.
An iceberg off Jackson Island.
Mountaineers climb the cornice of a polar glacier.
A woman doing tree pose or Vrksasana.
A rock climber climbing without ropes above the Mediterranean Sea.
Mallorca Island, Spain.
Children hoop rolling near the caves of Lubra.
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 remote camera captures a polar bear foraging for little auks.
Rugged cliffs on Tegetthoff Island.
An Ice climber leads a steep climb in the Ghost River Valley, Canadian Rockies.
Rocky Mountains, Alberta, Canada.
A puja ceremony at Everest's Base Camp.
Glacier's edge off Cape Flora.
A dramatic sky over Tegetthoff Island.
Close up of plant cushions on an island in Franz Josef Land.
A scientist explores Wiener Neustadt Island in a snowstorm.
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