The Minister’s Treehouse in Crossville, Tennessee is a 100ft structure built by minister Horace Burgess from the early 1990s through 2004. The entire building wraps around a giant tree and was built completely without blueprints, sprawling to an estimated 10,000 square feet inside, including a four-story swing set. Photographer Kristin Sweeting took a recent trip to the treehouse and took many of the photos above. (Credit)