King Da Ka in Jackson, NJ - The tallest roller coaster in the world. This upside down U-shaped track bolts up 45 stories in the sky-that’s 456 feet high! You’ll leave the station going from 0 to 128 mph in a jaw-dropping 3.5 seconds. It’s 90° straight up. And once you get to the top you’ll be plummeting right back down in a 270-degree spiral that is not recommended for wimps.