The ancient Roman structure used for chariot races is the Circus Maximus. Located in Rome, this massive arena could accommodate hundreds of thousands of spectators and was primarily used for chariot racing, a popular and thrilling event in Roman culture. Constructed in the 6th century BC, the Circus Maximus became the largest stadium in the ancient world, featuring a long, oval shape that allowed for competitive racing. Chariot teams, known as factions, would compete for glory, and the races were accompanied by elaborate celebrations. The Circus Maximus remains a significant archaeological site, reflecting the grandeur of Roman public entertainment.