World's Largest Treehouse

Located on the grounds of Alnwick Gardens just 95 miles south of Edinburgh (and next to the Alnwick Castle, the very one used in the Harry Potter films), this 6,000-square-foot tree house soars 56 feet above the ground and is connected with 4,000-square-feet of suspended walkways. It has a restaurant that seats 120 people as well as classrooms, cafes, turrets, wobbly bridges, and imported wood from all over the world. Oh, and it cost $7 million. Pretty cool, huh?