Necropolis of Ponte San Pietro is situated near the border with the territory of Manciano.
Besides the remains of the medieval bridge, there is a protovillanovian necropolis, in which there are artificial caves and tombs including the ‘ widow ‘ grave in which a young woman, with his skull smashed, was laid curled up at the foot of a warrior surrounded by weapons , one of the most important finds of the culture of the Rinaldone.
the bridge when it was erected, in the early 15th century, served to connect two States: the domains of the Pope (Saint Peter’s Patrimony in Tuscia) and those senesi (Sienese Republic). Its construction allowed an important development of communication routes, as the only other existing bridge in the area was that of Abbadia a Vulci.