World's Scariest Roller Coasters
Kingda Ka, New Jersey
Where: Six Flags Great Adventure in Jackson.
Scary Stat: 456-foot drop.
At 45 stories, the Kingda Ka is the tallest roller coaster on earth—closer to the sky than any Egyptian pyramid—and among the fastest, reaching 128 mph. It’s also one of only two existing Stratacoasters, rides that plummet more than 400 feet. (The other is Cedar Point’s intimidating Top Thrill Dragster.) Kingda Ka shoots riders around an upside-down U track in just 59 heart-stopping seconds. Except when it doesn’t. Beware of rollbacks, when, occasionally, the coaster doesn’t gather enough momentum to pump itself over the very top and plummets backward, forcing riders to experience the launch all over again.