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The Circus Maximus (or in Italian Circo Massimo) was one of the greatest entertainment venues of the ancient world. It was used for entertainment and in religious purposes. Some consider it as a predecessor of modern circuses. Today is a city park.
Circus of Maxentius is the best preserved circus from time of ancient Rome. It was designed and built with great care but it didn't see much use. Because of that we can today see, in great detail, how ancient circuses looked like.
Circus of Nero began as a place for public trainings of Caligula and Nero and became a place of martyrdom of many early Christians. When it was abandoned it became a place of not one but two basilicas.
Although almost nothing has left of Circus Flaminius today, we know that it existed and that it was important public place for hundreds of years where games and other public businesses were held.