Brace Yourself: Not all the scariest rides are roller coasters, a fact that everyone who has been to the top of the Space Needle-like Stratosphere hotel in Vegas knows only too well. Perched over the Strip, the most frightening of the Stratosphere’s three rides is an electric-green-colored centrifuge called Insanity, which extends 64 feet over the north edge of the tower. Spinning over 40 mph, riders are angled down by 70 degrees so all they see is the street, 900 feet below. This is truly one of the world’s most harrowing rides.
If You Chicken Out: The appropriately titled X-Scream is only slightly less frightening, propelling riders headfirst 27 feet over the edge of the building in a roller-coaster car, and dangling them in a weightless state before retracting the car and then repeating the whole thing at a steeper angle. Tip: the back seats are less scary.