In 2012, international surfing champion Greg Long set out to ride the biggest wave of his life. The monster wave nearly killed him. To truly recover, Long knew that he had to face the wave once more.

Each year, hundreds attempt to hike the 2,181 miles of the Appalachian Trail from Georgia to Maine. Long-distance hiker Jennifer Pharr Davis did it in 46 and a half days to become the overall speed record holder. Hear her tell the tale.

Climbing dream team Alex Honnold, Mark Synnott, and Jimmy Chin face rugged cliffs, knife-wielding thieves, and deadly waters as they traverse the globe searching for the next great rock to climb.

Accomplished climber Mike Libecki and photographer Cory Richards battle extreme cold and furious katabatic winds in an epic, ten-day climb to the summit of the untouched Bertha's Tower at the bottom of the world.

Explorer Tim Cope, accompanied by his canine companion, spent more than three years retracing the 6,000-mile route taken by history's greatest conqueror, Genghis Khan, and encountered many curious characters along the way.

Jaw-dropping footage in stunning locations doesn't come free. Find out why extreme adventure filmmaker Bryan Smith says that "the suffering co-efficient is my key to success."

Artist adventurer Dean Potter turns a harrowing slackline walk into a thing of beauty—with a little help from the moon.

More than 40 years after setting foot on the moon during the historic Apollo 11 mission, American astronaut Buzz Aldrin makes a passionate, thoughtful case for sending humans to the red planet by 2035.

Fifty years ago, Americans summited Mount Everest for the first time. To celebrate this anniversary, climbers Conrad Anker and Emily Harrington, writer Mark Jenkins, and naturalist Alton Byers meet to discuss the history and future of the world's highest peak.

World-renowned polar explorer Børge Ousland shares his harrowing and hilarious adventures exploring the North Pole by ski and circumnavigating the Arctic Ocean by sailboat.

Polar explorers Børge Ousland and Mike Horn battle pitch-darkness, subzero gales, and polar bears to become the first to reach the North Pole in the winter.

Having completed more solo trips to the Poles than anyone else on the planet, Børge Ousland is sometimes surprised by who he runs into crossing the vast Arctic tundra.

Hear the gripping account of Australian Douglas Mawson's 95-mile trek across Antarctic ice battling hunger, dire circumstances, and deadly crevasses, as told by award-winning writer and adventurer David Roberts.

An adventurous brother-sister team on a Nat Geo Young Explorers grant kite-ski over 2,000 miles through Canada's Arctic archipelago, fending off polar bears and coping with unfavorable winds and rugged ice along the way.

National Geographic grantee and archaeologist Mark Aldenderfer reveals the treasures waiting to be discovered within the sky caves of Nepal—stunning murals, deteriorating manuscripts, and ancient artifacts—in the second of this three-part series.

Photographer and adventurer Cory Richards chronicles the challenges and dangers of exploring the far-flung caves of Nepal, in the exciting conclusion of this three-part series.

Legendary climber Peter Athans joins a team of explorers to unearth the hidden relics of Nepal's ancient and remote caves, in the first of this three-part series.

There is nothing National Geographic's team of intrepid engineers can't create to get the "shot" from high in the sky or the deepest, darkest oceans.

National Geographic Fellow Corey Jaskolski's new 3-D technology puts you in the driver's seat and lets you explore the deepest underwater caves and the inner reaches of King Tut's tomb.

National Geographic engineers develop a tiny camera to show us what it's like to fly with a colugo—better known as a flying lemur.

After surviving a terrifying avalanche, Ed Viesturs is the first American to summit all 14 of the world's highest mountains without supplemental oxygen.

In 2011, mountaineer Gerlinde Kaltenbrunner became the first woman to summit all 14 of the world's 8,000-meter peaks without supplemental oxygen by completing a daring climb of K2.

Digital Nomad Andrew Evans finds himself on the most remote inhabited island in the world during a devastating oil spill.

Tweeting across 10,000 miles, Digital Nomad Andrew Evans is joined by thousands of followers who track in real time his epic journey from Washington, D.C., to Antarctica.