The TT Circuit Assen is a motorsport race track built in 1955 and located in Assen, Netherlands. Host of the Dutch TT, it is popularly referred to as "The Cathedral" of motorcycling by the fans of the sport. It has a capacity of 110,000 spectators, including 60,000 seats. Since 1992, the circuit has also been part of the Superbike World Championship calendar.
The current Assen race track was built in 1955, and initially had a length of 7,705 meters (4.788 mi). The track has a length of 4,555 meters with the mixture of super fast flat-out and slow corners. The longest straight is 560 meters. The curves in Assen were traditionally banked and the surface is extremely grippy, so the riders were able to drive much faster on the course than other circuits. Today these sloped or curved bends have been modified due to safety issues. On 6 July 2004 the organization announced plans for an amusement park located to the north of the track. In 2006 the northern loop was removed and the length was shortened to 4,555 meters. The new centre is expected to be visited by 300,000 people, and the total investment is approximately €85 million.