An unlikely duo from Boston treks to Bolivia, hoping to solve a 30-year-old aviation mystery.

Meet Seattle’s cycling vigilante, Bike Batman.

The Darién Gap is a lawless wilderness on the border of Colombia and Panama teeming with everything from deadly snakes to antigovernment guerrillas. For many migrants, crossing it is their only way to get to America.

In the late 1990s, a serial killer found his victims in Yosemite National Park.

The author investigates the massive wildlife die-off in the Salton Sea by rafting from its tributaries in Mexico.

A dispatch from a Russian town under siege by hungry bears.

Help came right away. And then it stopped.

What went wrong when a group of canyoneers was caught by a flash flood in Zion National Park.

The road to Lhakpa Sherpa’s seventh potential summit​ has been nothing if not complicated.

Searching for the source of British Columbia’s grim flotsam.

In Utah, an unlikely leader is looking to end the state’s land-use wars.

After too many tragedies, a veteran guide may turn his back on the mountain.

If you don’t get sick, was it really a vacation?

An ex-SEAL turns to “ocean therapy” to cope with chronic pain and PTSD.

On the Afghanistan-Pakistan border, women express themselves through fierce short poems.

“As the world’s best-known oceanographer—Sylvia is to our era what Jacques Cousteau was to an earlier one—she feels a heavy responsibility. In her lifetime, she has seen the ocean damaged in ways humans never thought it could be. The ongoing disaster leaves her mournful, desolate, and sometimes scary to talk to. Since her first dive, in a sponge-diver’s helmet in a Florida river when she was 16, she has spent 7,000 hours, or the better part of a year, underwater.”

An ocean race from the Olympic Peninsula to Alaska, with no motors allowed.

On the troubled, legendary Deschutes River fly-fishing guide.

Twenty-five years later, the deaths of a couple on the Trail remain shocking – and mostly unexplained.

When deep sea diver Dave Shaw reached the bottom of Bushman’s Hole, he discovered the body of Deon Dreyer. Though Dreyer had been gone for 10 years, Shaw was determined to bring him back.

A vegan sets out to see if there’s an ethical, sustainable way to eat fish in 2015.

A BASE jumper emerges from a coma after a bad fall and sets about rebuilding his body and his life.

On being among giant reptiles with a parent you don’t understand.

On Juliana Buhring, a former cult member who became the first woman to bike around the world.

A rookie competes in the World Elephant Polo Championships.