"Treehouse Masters: Out on a Limb" is enhanced episodes of a series in which tree-house designer Pete Nelson builds arboreal getaways that are large and ornate or small and simple.

For two and a half months, Nelson and his crew built the tree fort as customers pulled up lawn chairs to watch and sip coffee. "It was like a throwback to their 'Treehouse Masters' show on Animal ...

"We could be at your house tomorrow – bridges, ziplines, the whole thing," Treehouse Masters host Pete Nelson said in a Twitter video Grace Vanderwaal won $1 million and the title of America’s ...