Haley Mast is a freelance writer, fact-checker, and small organic farmer in the Columbia River Gorge. She enjoys gardening, reporting on environmental topics, and spending her time outside ...

Polestar, the Swedish maker of sustainable cars, has created a modern tree house called KOJA. With a mid-century flare and entirely made of sustainable materials, this is one cool experiment in ...

The treehouse grows up in this luxurious rendition that guests can rent. Built by the locally based Fort Treehouse Co., this 370-square-foot (34-square-meter) treehouse rises up two stories and spans ...

An eye-catching, midcentury modern "treehouse" that is secreted away among the greenery in Oregon has hit the market for $1.09 million—60 years after it was designed by renowned architect Otto Poticha ...