Oblong Piazza Navona, this is the site of the arena Roman Emperor Domitian in 86 AD, built (aristocratic casino), when the 15th century was re-paving. At present here is based on the Baroque square of beautiful architecture, majestic fountains, laid-back atmosphere and well-known, throughout the year there are various festivals and performances held here, one of Rome's most popular meeting place for people around the open-air cafes and ice cream parlors extremely popular. On the west side of the square church it was designed by Bernini's rivals Bologna Rimini, Bernini middle of the square is the most prestigious one magnificent sculpture Four Rivers Fountain. Four giant like just sitting on the rockery, natural look, the outflow of water from various springs in rockery gap and irregularly, and some sharp, some soothing, in the sunlight, bright colors, the whole look lively and full of fountains fun.