Piazza del Campo is a unique place in the whole of the world, starting with the very particular conformation of the ground, which turns the square into a big concave shell. The paving is made of red bricks arranged in fishbone style, divided into a sunburst pattern by nine strips of travertine (in memory of the Government of the Nine, who ruled over the city from 1292 to 1355).

The history of Siena has been made on the Piazza del Campo, or better, 'il Campo', as the Sienese call it. Here the Sienese organised their spectacular and terrible 'games', later replaced by the Palio, where they celebrated and played games of risk (il Campo was the only place where the games were allowed). The market also used to take place here. Il Campo has witnessed the passage of memorable characters in the history of Siena: Santa Caterina, the mystic saint deeply linked to the image of Siena, and also artists such as Simone Martini or Jacopo della Quercia.
The piazza took shape at the end of the 1200s, on a space that was for a long time used for fairs and markets and was situated at a crossroad of important streets. When it was built (the flooring dates back to the 1300s, it managed to hold the entire population of Siena, who gathered here to attend events, tournaments, and buffalo and bull races. Piazza del Campo has hosted almost all the important events in the history of the city, from the time of the Republic up until the Medici period, during which Siena come under the control of Firenze di Cosimo I de'Medici.