Circus Maximus

Circus Maximus, largest of the Roman hippodromes and one of the largest sports arenas ever built. A U-shaped structure with seats on three sides and a low wall running down the middle of the arena around which the chariots raced, it was rebuilt in the time of Julius Caesar (1st century bc) to seat an estimated 150,000 spectators. Enlarged by later emperors, it reached a maximum size under Constantine (4th century ad) of about 2,000...