There's something about getting high that helps you see things from a whole new perspective—and no, we're not talking about a trip to Amsterdam. Inspired by the March 2007 opening of the Grand Canyon Skywalk—a cantilevered, glass-bottomed walkway that lets you peer 4,000 feet down from the tips of your toes to the bottom of the gorge—we've searched high and low (but mainly high) to uncover a dozen stratospheric spots around the world that will have you gasping at the view or clinging, white-knuckled, to whoever is closest. You'll need special gear to enjoy some of these experiences; for others, a credit card and a smile will do. But all require nerves of steel and a resistance to vertigo. If you've got that, we'll show you the way to Cloud 9 (that's the name of the world's highest bar, by the way).
