Brace Yourself: First opened in 2002 as the world’s first “fourth-dimensional” ride, with 360-degree rotating seats and headfirst, facedown drops, Six Flags Magic Mountain’s X was closed in 2007 for a $10 million rejiggering. This May it has emerged, phoenixlike and more spine-tingling than ever, with new immersive tunnels, more audio and visual enhancements, and sleeker wing-shaped trains. For the uninitiated, it’s called four dimensional, or 4-D, because the seats extend off the track to the sides, allowing riders to independently rotate head over heels, forward and backward—giving that mind-bending dimensional effect.
If You Chicken Out: Take a ride on the classic coaster Revolution. When it opened in 1976, it featured the first loop in the world, changing roller coasters forever.