The Circuit de Spa-Francorchamps motor-racing circuit is the venue of the Formula One Belgian Grand Prix, and of the Spa 24 Hours and 1000 km Spa endurance races. It is also home to the all Volkswagen club event, 25 Hours of Spa, run by the Uniroyal Fun Cup. It is one of the most challenging race tracks in the world, mainly due to its fast, hilly and twisty nature. Spa is a the favorite circuit of many racing drivers and fans.