Picturesque scenery of the Giostra del Saracino, who runs here twice a year, Piazza Grande opens in the heart of the medieval city. With characteristic trapezoidal shape, occupies an area heavily inclinated. During the sixteenth century, was reduced to its current size with the realization of the Vasari loggia. This is the most profound alteration suffered by the installation of the medieval town square; the other side, where the building transformations related to the passage of time have been less radical, providing a harmonious synthesis of Tuscan architecture from the thirteenth to Settecento. At one side there are buildings and palaces of civil, used as a private residence, while the opposite side is fully occupied from the apse of the church of St. Mary, from the building of the former court and palace Fraternità. Piazza Grande ago by the extraordinary setting not only the Giostra del Saracino, but also to the Antiques Fair, which animates the square every first Sunday of the month and the previous Saturday.