This town started to be populated with inhabitants of the Prehistory with traces that were found where today are the oldest ways which belongs to the actual main historical center, around via della Terra. The town has a complexity of plans which are printed in various developments, as if it could have different directions to evolve an ideal, brought towards its completeness in the XV century, from the model of Siena – the leaf of the crown and the classic Athens reference of the foxil Nautilus. Some of the traces left behind (apart from the prehistoric levels) are concerned with the Roman period and, in modern times, with the disappearance of the Saint Thomas door and the hospital that had its name. Let us retrace the comparison: while Siena has Saint Mary as the actual general hospital of the town in regard of which replace the symbols of the basilica, Saint Thomas of Canterbury was a hospital probably for orphans as the one of Saint Catherine.