Often cited as one of the most beautiful squares in Rome, the Piazza Navona will sure enough impress you . It is built at the site of the former Domitian's stadium, built by emperor Domitian in 86 AD. At the rectangular square, the pride of Baroque Roman art history, you will find three fountains, including the Fontana dei Quattro Fiumi in the center. The Piazza is featured in Dan Brown's thriller Angels and Demons (and can also be seen in the movie, directed by Ron Howard).