We thought that Wisconsin resident John Peterson had gone overboard when he spent three years building his kids a 200 square foot treehouse. However, Mr. Peterson's treehouse pales in comparison to the one built by Tennessee resident Horace Burgess, who spent 11 years building this 10,000 square foot, 10-story tree-structure that he believes (and nobody is arguing), is the world's biggest!

The ordained minister who began this amazing endeavor in Crossville in 1993, says he was inspired by a vision from god, telling him he would never run out of materials if he embarked on the project. As it turns out, that proved to be true, given that the entire structure, which is now his primary home, has been built using reclaimed wood and recycled materials. Over the years, Mr. Burgess has spent a total of just 12,000 USD on this 100 ft tall structure - Most of it, on the 258,000 nails he used to put it together.

Nestled atop six trees, the treehouse that looks more like a mansion, features numerous rooms, a spiral staircase, walkways, balconies and even, a mini basketball court. For his 11th wedding anniversary, Mr. Burgess constructed a special penthouse tower for his wife, which is decorated with chimes made from recycled oxygen acetylene bottles, that weigh 5,700 pounds. So is Mr. Burgess finally done? Only time will tell!

Resources: Gizmondo.com, dailymail.co.uk, inhabitat.com