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.
Spanish Grand Prix
From , the Spanish Grand Prix was due to alternate every year between Catalunya and the Valencia Street Circuit. However, this did not happen—Valencia dropped out for financial reasons and Catalunya remained the sole host of the Spanish Grand Prix.