Some people think John Muir was a hero. Others: not so much. The Adventure Brothers hike the famous John Muir Trail (a.k.a. Nüümü Poyo) to investigate the conservationist's controversial legacy.

The series, 'Yellowstone to Yosemite with Kevin Costner,' will see the actor tracing the 1903 Yosemite expedition of Teddy Roosevelt and environmental advocate John Muir. By Alex Weprin Media ...