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.
Circuito Retiro
The Circuito Retiro, commonly known as the Retiro Circuit was a Grand Prix street circuit in Buenos Aires (Argentina). The 2.410 km (1.497 m) circuit is best known for hosting the first official Buenos Aires Grand Prix (I Gran Premio Ciudad de Buenos Aires, official name: Gran Premio Juan Domingo Perón) on February 9, 1947, as the first organized international event by the Automóvil Club Argentino.