ZipRider at Icy Strait Point, Alaska

The world's longest zipline ride runs some 5,495 feet, but only takes 90 seconds to complete. What makes the ZipRider experience at Icy Strait Point memorable isn't the view – though Port Frederick looks great from above – but the feeling of cold air coming at you at 65 miles per hour. The reason the trip is so quick is that it's extremely vertical. The top towers 1,320 feet above the base.