At what point does a treehouse stop being a treehouse and become a house with trees running through it? Horace Burgess, owner of the Crossville Treehouse doesn’t have any more of an answer than we do. This massive structure modeled after a kid’s favorite hangout is 97 feet tall. That’s ten stories of “boys only” signs and secret club meetings. (Actually the only signs present are no smoking signs, since you probably shouldn’t light a match around this many scraps of wood.) If you’re ever in the neighborhood of Crossville, Tennessee feel free to stop by and check out the world’s largest treehouse.