"World's First Climbing Wall" atop a building designed to create the illusion that the building below you just disappears. The Cliff Hanger climbing wall is positioned 7 feet from the edge of the building on the 2nd floor of the roof top extreme tower 473 feet off the ground. If that isn’t enough to excite you, after climbing the first 13 feet, the wall angles in causing the building to vanish beneath you leaving you with the view of the city below. Cliff Hanger is also the first climbing wall designed to allow climbers to exit at the top, 507 feet from the ground below.