Kingda Ka, at Six Flags Great Adventure in Jackson, New Jersey, is the ultimate ride on several fronts. As of 2007, it was the tallest and fastest roller coaster on the planet. Reaching 128 miles per hour in 3.5 seconds, the train rockets straight up to the 456-foot apex. Crossing over the pinnacle, the train plummets straight down into a vertical, hair-raising descent through a spiral twist at speeds of more than 100 miles per hour. Riders then face a 129-foot tall hill that bounces them out of their seats for a few seconds.