Piazza Navona is a public open space in Rome, Italy. It is built on the site of the 1st century AD Stadium of Domitian and follows the form of the open space of the stadium in an elongated oval. The ancient Romans went there to watch the agones ("games"), and hence it was known as "Circus Agonalis". It is believed that over time the name changed to in avone to navone and eventually to navona.

A square is an open public space used for various activities. Squares are not necessarily a true geometric square. Most squares are hardscapes suitable for open markets, concerts, political rallies, and other events that require firm ground.