Circus Maximus was ancient Rome's largest stadium and one of the biggest in history, accommodating 250,000 spectators for chariot races. Today it remains as an open grassy valley between the Aventine and Palatine hills, perfect for picnics, jogging, and concerts with views of the imperial palaces above. The Circo Maximo Experience offers an immersive VR tour recreating the ancient stadium in its glory. Free to explore the grounds anytime.