This treehouse is definitely not child’s play: located in Crosville, Tennessee, it’s 10,000 square feet of jaw-dropping wonder. Built by a local priest named Horace Burgess in 1933, the behemoth structure took 14 years and 245,000 nails to complete. The treehouse’s base is supported by six load-bearing trees and one gigantic 85-foot oak tree.

Inside, you’ll see a small church and a basketball court. The treehouse has apparently been closed since 2012 for violating fire codes.