The Route Makers - Episode 3: The Concrete Wilderness

The Route Makers Episode 3: Liz "Snorkel" Thomas and Alexandra "Sunshine" Kenin on urban thru-hiking: inventing 100-mile hiking routes through American cities, mapping a thousand San Francisco staircases, and proving a 3,000-foot climb is a 3,000-foot climb whether it's in the Sierra or the middle of downtown.

The first two episodes took us into the emptiest country left in America. This one heads the other direction: downtown. Turns out the impulse to look at a place and imagine a route through it doesn't need a wilderness. Sometimes all it needs is a city.

Settle in for the third episode of our documentary series.