I couldn't have come across The World's Tallest Treehouse at a more fortuitous time: part of our rental home flooded yesterday. A treehouse that could have drained water would have been way more awesome than trying to salvage furniture and slogging through 3 inches of water. Fortunately it was clean water. Small blessings!
Anyhow, this house is in Crossville, TN and was built by a minister who had a calling. It is on my list of places to visit once I get back to the South. You can learn more about it here.