Pixar's Cars 2 shows three World Grand Prix race locations: Tokyo, Porto Corsa, and London.
The first race takes place in Tokyo, Japan, where the competitors race through a neon-lit city course. The second is held in Porto Corsa, a fictional Italian coastal location designed with Mediterranean architecture and roads. The final race is staged in London, England, and takes place around landmarks including Buckingham Palace and the London Eye.
These three settings give the film a deliberately international structure. The World Grand Prix is presented as a competition created to promote Allinol, an alternative fuel, but the races also provide the backdrop for Mater's accidental involvement in an espionage investigation. Cars 2 is therefore both a racing film and a spy story. The locations should not be counted as every city visited by the characters, since the question concerns the official World Grand Prix race venues.