Don't have time to make it to the Alps for climbing around lofty heights? No sweat. Just head to the Olympic Stadium for a walk on the roof . Yup, the roof; that famously contorted steel and plexiglass confection is ready for its close-up. Just like on the mountains, you'll be roped and hooked up to a steel cable as you clamber around under the eagle-eyed supervision of an experienced guide showering you with fascinating details about the stadium's architecture and construction. Unusual perspectives are guaranteed, but the vertigo-prone might want to take a pass on this one. Minimum age is 10 and expeditions last two hours. Wear rubber-soled shoes.