Exterior, Treehouse Building Type, and Wood Siding Material Ethan Schussler built his first tree house at 12 years old. His tree house in Sandpoint, Idaho, sits 30 feet above the ground and can be accessed by an "elevator" consisting of a bicycle that, when pedaled, ascends a pulley system to the top.  Best Photos from Tour 8 Awesome Tiny Cabins Around the World