This Romanesque edifice was built in the 11 and 12C on the site of a former acropolis and was remodelled in the 13C with Gothic additions. Outside you will admire the three Romanesque apses, the Roman campanile, and the statue of the unhappy pope Bon..

Nearly entirely made up of buildings from the 13C, this particularly evocative quarter is endowed with palaces, like that of Boniface VIII with its façade made up of two superposed galleries with openwork designs, and a town hall (or palazzo Comm..