Spanish Grand Prix
The first Spanish Grand Prix in 1913 was not actually run to the Grand Prix formula of the day, but to touring car rules, taking place on a 300-kilometre road circuit at Guadarrama, near Madrid, on the road to Valladolid.
Montjuïc
The roads in the slopes facing the city were once the Montjuïc circuit Formula One race track, hosting the Spanish Grand Prix on four occasions. However, a terrible accident in the 1975 race saw Rolf Stommelen's car crash into the stands, killing four people; as a result the Spanish Grand Prix never returned to Montjuïc circuit.