Circus Maximus
One of the largest stadium ever created Circus Maximus could accommodate more spectators then any stadium till today. It was almost half a kilometer long which hosted countless death defying acts. It could hold up to three hundred thousand people to watch entertainment.
Circus Maximus is very well known for it's Chariot Racing, but it wasn't limited to that it also conducted prisoner executions, gladiatorial matches, animal hunting, and parades. In the middle it showed it's enemies structural backbones as showpiece to Roman conquering might.