One of the most characteristic squares in the city is the Piazza di Spagna. The Piazza di Spagna stretches out for over 270 meters and is divided into two triangular areas. Surrounded by outstanding buildings, such as the Palazzo di Propaganda Fide, it was the seat "of the Congregation of Propaganda Fide in 1622 as instituted by Pope Gregory XV. The square is centered on the Barcaccia Fountain, by Pietro Bernini (1627-1629), an ingenious and lively representation of a large boat which is sinking and spouting water from both stern and prow.

The Fountain of Trinita Dei Monti has been referred as pleasing as it is simple. It consists of an ancient basin of red granite, about 4 meters across, resting on a large octagonal-based baluster emerging from an equally octagonal water pool at ground level. According to narratives written about the fountain, there are very few records of the history of this fountain, and even those have no basis in fact. It is believed that due to the shortage of materials pertaining to the fountain’s history, authors have had to embroider stories about the fountain which somewhat until, as one thread followed another; the most exotic flowers blossomed dramatically around this serene and anything but ostentatious little fountain. Accordingly, among the many complicated Pindaric flights of fancy that surround this fountain, it will be enough to select one that is quite recent, since it embraces all the digressions of the earlier writers. Pindaric by the way is the name by which was known a class of loose and irregular odes greatly in fashion in England during the close of the 17th and the beginning of the 18th century. With this said however, the fountain had been described as "the masterpiece by Alessandro de’ Medici and Annibale Lipp is definitely the most beautiful of all the Roman fountains".