6. Shivering Timbers, a wooden roller coaster at Michigan's Adventure in Muskegon, Mich.
7. Boulder Dash, Lake Compounce in Bristol, Conn.
8.Twilight Zone Tower of Terror, Disney MGM Studios, Lake Buena Vista, Fla.
9.Titan, Six Flags Over Texas, in Arlington, Texas. At 255 feet above the earth, the steel superstructure features one of the world's mightiest drops at hyper speeds of 85 miles an hour. Guests speed through three-and-a-half minutes of spectacular plunges, a 120-foot-long tunnel shrouded in total darkness, a series of camelback hills, huge spiral curves, and high-speed helixes.
10. Nitro, Six Flags Great Adventure in Jackson, N. J. It takes thrill-lovers on a white-knuckled ascent to the top of its lift hill, topping off at 230 feet only to dive 215 feet back to Earth at a mind-numbing speed approaching 80 mph.