Season 9

Pete takes on his first international tree house in Norway; working alongside a local builder named Frode, the one-of-a-kind, 24-foot-high retreat accommodates eight and allows for stunning views of the nearby lake.

Pete and his gang ride out to the Lone Star State to build a double-decker hideout in Texas Hill Country; Pete creates rustic perfection in six live oak trees with a saloon-style first floor for sippin' sarsaparilla and a glass floor for views below.

The NTS team leave their tents behind and head to New Jersey to build a campers' retreat for an outdoor-loving couple; with a screened-in porch, floating barbecue deck and cozy hanging bed, this Adirondack style tree-cabin puts glamping in the trees.

Getting lost in the forest for some behind-the-scenes fun with tree house master Pete Nelson as he uncovers never-before-seen footage, bloopers and loads of extra tree house tours, including a new peek inside Dale Earnhardt Jr.'s arboreal escape.

Pete descends upon western Washington to make a tree house for action and relaxation; with a 55-foot-long bouncy-bridge entryway into a 20-foot-high structure and a zip line that travels through the forest, this tree house generates non-stop thrills.

Pete and his team descend upon Virginia for the first time to bring the tree house revolution to Bella Rose Plantation; drawing on the architectural innovations of Thomas Jefferson, Pete designs a luxurious two-story tree house with colonial columns.

Two retirees get a retreat on their 100-acre Wisconsin farm; Pete builds a barnlike birdhouse with three separate pods -- an art studio, an office and a lounge -- complete with a screened-in porch and a deck overlooking their stable of alpacas.

Pete is back in Texas to build a sophisticated, sleek-and-chic treehouse in the heart of Dallas; Daryl and the NTS team put treehouse engineering to the ultimate test at Washington State University, proving down-to-the-pound the power of the TAB.

When asked in 2016 what she would do with her winnings, ``America's Got Talent'' Season 11 winner Grace Vanderwaal said she wanted a tree house built by Pete Nelson; the 13-year-old singer-songwriter's wish comes true.

Pete builds an A-frame lodge in the shadow of North America's highest peak.