A facade that is composed of buildings dating from the 13th C. (on the left) to the 15th C. (on the right) and in the center a large portal topped by a statue of Pope Gregory XIII, and a charming statue of Virgin and Child by Niccolo dell'Arca on the left side of the portal, up high. At the back of the courtyard, a ramp that makes it easy to come in with horses, and leads to the sumptuous rooms housing the municipal art collection, rich with paintings from the Emilien school.