Bringing new meaning to the phrase "off the rails," Six Flags Great America's new roller coaster, X Flight, opens to the public on May 16 with one very unusual feature: There is no track above or below you. Thrill seekers sit in pairs, suspended on either side of the track with feet dangling, soaring at speeds of 55 mph through 3,000 feet of drops and various inversions, including a barrel roll and 360-degree twists. Intrigued, we asked Dave Altman, the president of American Coaster Enthusiasts, to compile the ultimate roller-coaster bucket list, which loops and rolls all the way from Sweden to Brooklyn. Don't forget to pack your Dramamine.
Here's the X Flight simulation video, which will either persuade you to visit Chicago or swear off thrill rides forever: