Courtesy of Thorpe Park Location: Thorpe Park, United Kingdom Capacity: 1,300 passengers per hour Estimated Cost: £13.5 million ($20.7 million) When it opened on March 22, 2002, this steel monster - built in Switzerland - was the first of its kind to flip riders upside-down 10 different times: through a vertical loop, a cobra roll, a double corkscrew and five zero-G rolls. Next Kingda Ka