Circus Maximus: Rome's entertainment center.<BR>The Circus Maximus is an ancient arena and mass entertainment center located in Rome, Italy. It was first built about 600 BC. Situated in the valley between the Palatine and Aventine Hills, it met the demands of the Roman people for mass public entertainment on a lavish scale, primarily chariot races, but also wild beast fights and naval battles. Julius Caesar expanded the Circus around 50 BC, after which the track measured approximately 1800 feet in length, and 750 feet in breadth and could accommodate an estimated 150,000 to 350,000 seated spectators.