Hotel Posada Mirador (Sinaloa, México), seated on the edge of Copper Canyon. As the nest of an eagle seated on the edge of a ravine, luxury accommodations. It's 51 rooms
Um screw a tree house, build me a tree mansion! Horace Burgess (in Tennessee) built a tree house, with a whopping square meters (nearly square feet) and standing 90 feet tall! It took fifteen years.