One of the spectacular and typical urban complexes of Baroque Rome. The buildings built on the ruins of the Domitian stadium – of which the square preserves its shape and dimensions – mark its boundary. Festivals, races and jousts took place through the centuries in the square.
Since the 17th century until mid-19th century, on Saturdays and Sundays of August the square, at the time with a hollow ground, was partially flooded and naumachias took place here. Today, during the Epiphany, there is a market selling crib figurines, games and sweets.
Three fountains decorate the square: the Fontana del Moro, so called for the statue of the Moor fighting a dolphin; the Fontana dei Fiumi, one of the most beautiful and fanciful works by Bernini; the Fontana de' Calderari, aka the Fontana del Nettuno.
Opposite the Fontana dei Fiumi is the Church of Sant'Agnese in Agone, began by Carlo and Girolamo Rainaldi during the age of pope Innocent X and completed by Borromini who changed it deeply and made of it a masterpiece.
Next to the Church is Palazzo Pamphili, a work by Girolamo Rainaldi, since 1960 seat of the Brazilian embassy. Opposite the palazzo is the church of Nostra Signora del Sacro Cuore already San Giacomo degli Spagnoli, built for the Jubilee of the year 1450.