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This octagonal square, officially named Piazza Vigliena, was laid out between 1608 and 1620. It is situated at the intersection of two main historical thoroughfares, Via Maqueda and Corso Vittorio Emanuele. The square is a significant example of Baroque urban planning in Europe and is characterized by its four concave facades, which give the space its distinctive shape.

Each of the four facades is intricately decorated and organized into multiple tiers. The lower levels feature fountains, while the upper sections contain statues representing the four seasons, four Spanish kings, and the four original patron saints of the city. These architectural elements represent a significant artistic achievement of the early 17th century.

Known locally as Quattro Canti, or "four corners," the square historically served as the center of the city's four main quarters. The site remains a prominent monument of Baroque architecture and a central point of the historic district.