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1 of 10    Dodonpa opened in 2001 and is a steel sit-down roller coaster with a compressed air launch. It is 52 metres (170 feet) tall, and has a launch speed of 172 km/h (107 mph), which is reached in less than 2 seconds. The launch is followed by a huge, sweeping, overbanked curve, giving riders a chance to catch their breath back, before they hit the 170 foot top hat; an element with some extreme negative G forces. The name ‘Dodonpa’ comes from the musical sound which is played to customers waiting to board it.