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.

Join Pete on a treehouse vacation to the pine-forested splendor of Scandinavia. First stop: the magical TreeTop Hotel in Norway. Pete then heads to the Swedish treetops and takes a swim in a frozen lake before checking in at the renowned Treehotel.

Pete and NTS build a treehouse for the For-Mar Nature Preserve just outside Flint, MI. The 5-platform nature headquarters will serve 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 a first - a glass house in the sky. Piecing materials together like a puzzle, Pete uses his clients' collection of 50 vintage windows to construct an elegant treehouse encased by walls of glass.

Pete pushes his design-skills to create an owl-inspired library in Charlotte, NC. Evoking the face of the bird and using all sorts of curves, including rounded walls and semi-circle bookcases, the NTS crew constructs a one-of-a-kind masterpiece.

In this special season finale, Pete surprises two lucky winners to receive complete, top-to-bottom, $20,000 renovations of their existing treehouses, giving old, rundown childhood structures much needed repairs, remodels, and complete makeovers.

A man builds one-of-a-kind treehouses.

A man builds one-of-a-kind treehouses.

A man builds one-of-a-kind treehouses.

A man builds one-of-a-kind treehouses.

A man builds one-of-a-kind treehouses.