The House on the Rock. Spring Green, Wisconsin. (40 miles west of Madison) What began as a 13-room home has evolved into an attraction that houses, among other things, the world's biggest carousel and a sea monster that measures 200-feet tall. You can also visit the Infinity Room, which hovers more than 150 feet in the air. A trip to the house, a complex of buildings, gardens and exhibits, has been divided into three different tours.