Sixty-eight seasons of Formula One, the highest class of open wheeled auto racing defined by the Fédération Internationale de l'Automobile (FIA), motorsport's world governing body, have been run. The F1 world championship season consists of a series of races, known as Grands Prix, held usually on purpose-built circuits, and in a few cases on closed city streets, the most famous of which is the Monaco Grand Prix in Monte Carlo. The results of each race are combined to determine two annual World Championships, one for drivers and one for constructors.