Almost as soon as we leave the trailhead, we're in what's called the John Krebs Wilderness. BISHOP: I'm curious if we'll see a wilderness sign, that say we're entering the designated wilderness.

The nation's first official wilderness turned 100 this year. But today, the definition of wilderness is being tested. KALW reporter Marissa Ortega-Welch has been hiking in the wilderness for over 20 ...