Located in the heart of Rome's historic center, not far from the Pantheon, the square is a rectangular open city square. The square has an ancient Roman obelisk, which is based on the famous sculpture of Bernini in 1651, the "Four Rivers Fountain", and the square has two other fountains, the Moor Fountain and the Sea Fountain. The square was the Tumishan Arena during the Roman Empire. The fifteenth century became the central market in Rome. In 1650, Pope Innocent X was born to the Panfili family, and a palace was built in the southwest corner of the square, the Panfili Palace (now the Brazilian Embassy), and a baroque church, the St. Ignus, They are masterpieces of famous architect Boromini. The square is very sun-drenched during the summer day and the photo is not very good. After the sun set, it completely changed into a world, very lively, and dinner and coffee in several restaurants, cafes around the square is a good experience.