You don't have to base jump, sky dive, or climb into a glider to get serious hang time. These zip lines plummet thousands of feet, run past massive waterfalls, and cut through tropical canopies. It's as safe as it is fun and ziplining offers an exciting way to get a different perspective on a new destination. But not all wire routes are created equal. These are the world's most scenic, fastest, and intriguing. Clip in.