5. Jumeirah Sceirah – Dubai
At Wild Wadi Waterpark in Dubai, this ride starts with you standing inside a clear launch capsule, heart pounding. A countdown begins, then the floor suddenly disappears beneath your feet. You’re instantly in a free-fall, zipping down a 120-foot slide at over 50 mph. The view of the Burj Al Arab is incredible — if you can manage to look before screaming all the way down.