Piazza Navona is the most famous Roman Baroque square, known for its design as well as the sculptural masterpieces of Bernini and Borromini. The square was built on top of the 1st century Stadium of Domitian. The square took it spresent shape in the 15th century, when it was defined as a public space. The Fontana dei Quattro Fiumi or "Fountain of the Four Rivers" is situated in the center of the piazza, in front of the Church of Sant'Agnese, and it's considered a Baroque masterpiece. Another prominent landmark of the piazza is the Pamphili Palace situated next to the Church of Saint Agnese and erected between 1644 and 1650. Other monuments on the Piazza Navona include: Stabilimenti Spagnoli, Palazzo de Cupis, Palazzo Torres Massimo Lancellotti, Church of Nostra Signora del Sacro Cuore and Palazzo Braschi (now housing Museo di Roma).Another well known Roman square is Piazza di Spagna. This square got its named after the Palazzo di Spagna built in the 17th century in order to house the Spanish Embassy to the Holy See. The square is shaped as a crooked bow, and is dominated by the so-called Spanish Steps and an early Baroque fountain called La Fontana della Barcaccia ("Fountain of the Old Boat").

Piazza del Popolo is situated inside the northern gate in the Aurelian Walls, once known as the Porta Flaminia and nowadays called Porta del Popolo. This square was for centuries the first place to be spotted by travllers journeying to Rome. The square got its present-day shape in the 19th century, when it was designed by the architect Giuseppe Valadier in Neoclassical style. Valadier's design incorporated the verdure of trees as an essential element; and this he achieved by forming two semicircles by demolishing several buildings which stood in the previous trapezoidal square. The entrance to the square is marked by the two churches, also known as the "twin" churches (chiese gemelle): church of Santa Maria in Montesanto (on the left) and church of Santa Maria dei Miracoli (on the right), both dating from the 17th century. The churches were started by Carlo Rainaldi and finished by Bernini and Carlo Fontana. The twin churches are not exactly the same, but vary in details, offering variety within their symmetrical balance; which is a mark of the Baroque fashion. Between these two churches is Via del Corso, one of the tridente. Il tridente is the name for the three streets springing from the square: the Via del Corso in the center, the Via del Babuino on the left (opened in 1525 as the Via Paolina) and the Via di Ripetta (opened by Leo X in 1518 as the Via Leonina) on the right. Via del Corso follows the course extended beyond the city gate as the ancient Roman Via Flaminia, Via Flaminia, also known as the Via Lata during the Middle Ages and nowadays as the Via del Corso leads to the Piazza Venezia; Via di Ripetta goes past the Mausoleum of Augustus to the Tiber, to the riverside landing called the Porto di Ripetta, which was in function until the late 19th century; and the Via del Babuino ("Baboon") links Piazza di Spagna with Piazza del Popolo. The name of this latter street was taken from a grotesque sculpture of Silenus that gained the popular name of "the Baboon".