Piazza del Campo is the main public space of the historic center of Siena, Tuscany, Italy and is regarded as one of Europe's greatest medieval squares. It is renowned worldwide for its beauty and architectural integrity. The Palazzo Pubblico and its Torre del Mangia, as well as various palazzi signorili surround the shell-shaped piazza. At the northwest edge is the Fonte Gaia.

The twice-a-year horse-race, Palio di Siena, is held around the edges of the piazza. The piazza is also the finish of the annual road cycling race Strade Bianche. The open site was a marketplace established before the thirteenth century on a sloping site near the meeting point of the three hillside communities that coalesced to form Siena: the Castellare, the San Martino and the Camollia. 

Siena may have had earlier Etruscan settlements, but it was not a considerable Roman settlement, and the campo does not lie on the site of a Roman forum, as is sometimes suggested. It was paved in 1349 in fishbone-patterned red brick with 8 lines of travertine, which divide the piazza into 9 sections, radiating from the mouth of the gavinone (the central water drain) in front of the Palazzo Pubblico. 

- Wikipedia