The Piazza Navona stands on the site of the ancient Stadium of Domitian, which was inaugurated circa 86 CE. The stadium, which could accommodate in the region of 30,000 spectators, was designed for athletic contests. The shape of Piazza Navona, curved at the north end and straight at the south, closely preserves that of the original running track (192 by 53 metres).
Fountain of the Four Rivers
In the centre of Piazza Navona soars the Fontana dei Quattro Fiumi(Fountain of Four Rivers), one of Bernini's many masterpieces.