This oval basin, nearly 600 meters long, is almost entirely filled in with dirt. It was once a race track. It was made in the time of the Etruscan kings (presumably Tarquinio Prisco).
Augustus adorned the brick structure with an imperial stage, which was rebuilt by Trajan, enlarged by Caracalla and restored by Constantine.
During the reign of Constantine, the Circus could hold more than 200,000 spectators. Today only the outline remains (the area it occupied is now a public garden).
Address: Viale del Circo Massimo