An outdoor circuit allows the Cité de l'Automobile to grow from 10 to 20 acres (4 to 8 ha) and introduces an open-air theater in the exhibition complex. The Cité de l'Automobile is the first museum to create an autodrome, whose stands can accommodate 4,500 people. Some of the most emblematic and prestigious cars of the museum sometimes parade on its three rings. The autodrome also welcomes automobile associations and clubs animated by collectors and enthusiasts.