A journey to Valhalla, Oregon’s hidden canyon

Just miles from Portland, Oregon, there's a natural wonder that was first spotted in 2010. More

Few places on this planet have gone unexplored. Just 60 miles from Portland, Oregon, there's a natural wonder that was first spotted in 2010. Last summer, an expedition team navigated for three days to reach their goal: Valhalla Canyon. Oregon Public Broadcasting chronicles that effort in a new documentary.

AIR DATE 2/4/16