GeForce, Holiday Park (Germany)
The reason why this is high up on the list is because of an accident in 2010 that had no explanation. The 4th car was suddenly derailed while it was running at a really fast speed. The good news though is that no one was hurt, although the riders have to be rescued by firefighters. It may not be the fastest or longest ride, but this story will definitely give you chills the moment you decide to take the ride.
