Kingda Ka, Six Flags Great Adventure (Jackson, New Jersey)

The tallest and fastest roller coaster in North America establishes its credentials right away. Riders reach 128 miles per hour in just three and a half seconds after climbing a 456-foot peak at a 90-degree angle. The drop is a stomach-turning 270-degree spiral. The entire ride lasts 50.6 seconds, but the dizzying effect will stay with you for an hour or two.