In a forest along the Hudson River north of New York City, a strange new building is slowly rising. The strangeness of the building is that it’s meant to be occupied by humans, animals, and plants.

I built my kids a treehouse without a tree by creating an elevated playhouse on posts. It's a smart backyard DIY that’s as ...

A treehouse can be a magical place for children, who experience the space as a clubhouse, a hideout, a campsite, and more. If you’re wondering how to build a treehouse for your own family, first off, ...