Joshua Prestin

David Snider, 57, fell, lost his glasses, and spent five days wandering lost in Washington’s Olympic Range in May 2012.

Mike Gersack (35) and his wife, Shawna Ridge (38), were attacked by a grizzly near Big Sky, Montana, on May 13, 2011.

Here are some key skills every hiker should know before entering bear country.

Ed Rosenthal, 68, spent six days lost in Joshua Tree National Park in September, 2010.

Two kayakers survive a howling inferno by clinging to their crafts in the middle of a frigid lake-and then hypothermia threatens.

A solo hiker tries to claw her way out of a frozen cave after a winter pathway collapses.

A violent storm ravages a stressed forest, threatening to crush two dayhikers.