Introduction to Piazza Navona: Piazza Navona (Piazza Navona) was originally the arena of Domitian in ancient Rome in the 1st century AD and was turned into a market at the end of the 15th century. This square is famous for its Baroque art, with the Four Rivers Fountain as the most important landscape. In addition, the galleries of the Passion Church of St. Ignatius designed by Boromini and Rainardi and the Palazzo Pamphili designed by Pietro are also here.