Lev encounters many dangerous predators during the last leg of his journey.

In Maine, Pete takes you behind-the-scenes to reveal the masterful architectural details and woodcraft in a treehouse inspired by the fantastical castles of a famous children's book series

All the build's a stage in this Behind the Build, where Pete reveals the techniques and inspiration for this Tudor-style treehouse modeled after Shakespeare's Globe Theatre, complete with stage and trapdoor!

Pete takes us on a tour of this unique treehouse with three separate pods – art studio, office, and lounge – that make this barnlike, birdhouse-inspired treehouse the perfect playland for two retirees.

Pete shows off the rustic treehouse he and the team built on the banks of the Mississippi, revealing how he and Christina used reclaimed materials to create a unique twist on a river shaft fit for Mark Twain himself.

Go behind the scenes of America's Got Talent Winner Grace Vanderwaal's "sick" double treehouse, which the 13-year-old musical phenom helped design for herself and her sister.

Immerse yourself in a special tour of the steam bath in the sky that Pete and his crew built in Talkeetna, Alaska for the adventurous couple who founded the Alaska Mountaineering School.

Pete provides insight into the build of this off-the-grid escape in rural Washington state that he and the NTS crew built for a special friend, Sarah Jay of Dream Nets.

Pete takes you behind the scenes of the his first-ever joint venture, a French-themed chapel-of-love bed and breakfast in the aptly-named Utopia, Texas, featuring gorgeous Cyprus trees and the biggest bathroom he's ever built!

Join Pete on this behind-the-build tour of a treehouse fit for a king, and the knights of his round table. The medieval-inspired treehouse features a glass moon door floor, medieval style iron work, and a 25 foot-high tower.

Bees get fearless explorer Coyote Peterson's head buzzing.

Josh sets sail for Florida chasing the long-lost treasure of Jose Gaspar.

A Boomer, a Millennial and a Gen-Xer face three grizzly bears.

Jane hunts caribou in the Arctic Circle ... alone.

The team investigates Bigfoot sightings along the Appalachian Trail.

The team investigates new Bigfoot sightings in the Four Corners of America.