The so-called Circus of Nero or Circus of Caligula was a circus in ancient Rome, located mostly in the present-day Vatican City.
Drawing of the Circus of Nero (Pietro Santi Bartoli, 1699)
A Roman circus was a large open-air venue used mainly for chariot races, although sometimes serving other purposes. It was similar to the ancient Greek hippodrome. Along with theatres and amphitheatres, circuses were one of the main entertainment venues at the time.
The site of the former Circus Maximus in modern-day Rome
Floorplan of Circus Maximus. This design is typical of Roman circuses.
Circus, with chariot-race going on: the central division (spina) with its dolphin fountains, and the conical metae. Astarte on her lion, placed on the spina, being the tutelary goddess of Carthage, may indicate that this is the Circus of Carthage. After engraving in sard, much enlarged in the drawing; found at Binchester (Binovium).
Image: Arles, cirque romain 5