Rome's marvellous collection of piazzas make great resting places on your walks around Rome, and beautifully present the city's Baroque face. Vast and beautiful, Piazza Navona was laid out on the ruins of Domitian's stadium. It's lined with Baroque palaces, and holds three fountains, including Bernini's Fountain of the Rivers. In Renaissance times, the piazza was flooded on festive occasions and used to stage mock naval battles.