Pete and his merry men trek to the Blue Ridge Mountains to build a treehouse for one of their own: carpenter Mike Reynolds. Sitting 16 feet high, it will be the perfect rustic guesthouse to host friends and family.

Pete journeys to the pine-forested splendor of Scandinavia to explore Norway's magical TreeTop Hotel and Sweden's floating Treehotel, with tree homes suspended by cables and accessed only by retractable ladders.

Pete and NTS build a tree house for the For-Mar Nature Preserve just outside Flint, Mich.; the 5-platform nature headquarters serves as a positive addition to a community still reeling from the water crisis that began in 2014.

Pete treks to New York's Catskill Mountains to build his first glass house in the sky; piecing materials together like a puzzle, Pete uses his clients' collection of 50 vintage windows to construct an elegant tree house encased by walls of glass.

Pete pushes his design skills to create an owl-inspired tree house library in Charlotte, N.C.; evoking the face of the bird and using all sorts of curves, including rounded walls and semi-circle bookcases, the crew builds a one-of-a-kind masterpiece.