It rises on the ancient Stadium of Domitian whose elliptic form is maintained. It is one of the most beautiful and famous squares in Rome where you can admire masterpieces done by Bernini, Borromini and Giacomo Della Porta who was among the most important exponents of Baroque Art.
In the square there are three magnificent fountains: the central one, Fontana dei Fiumi by Bernini is topped by the Obelisk of Domitian, brought here in pieces from the Circus of Maxentius; the lateral ones, the Moor's Fountain and the Calderoni Fountain drawn by Giacomo Della Porta and also knows as Fountain of Neptune. In the centre of the square, in front of the berninian fountain stands the Church of St. Agnes in Agone, built by the architect Rainaldi and Borromini; it represents a magnificent example of Baroque building. Inside the church you can see the Tomb Monument of Pope Innocent X, erected in the church above the main entrance in 1729 and a shrine of Saint Agnes, containing her skull.
This is one of the most frequented places in Rome, many tourists and Romans meet here every evening and stay until late night, moving from a club of the neighborhood to the many kinds of restaurants or wine shops whose area is full.