The Cathedral of San Michele opens onto the square of the same name, the heart of the city. The façade, without a definitive makeover, offers a reading of the various changes made to the building in different eras. From the Romanesque church with a single nave, visible in the lower and central part, separated from the bell tower, to a subsequent expansion in the Gothic style with the addition of the aisles and the incorporation of the bell tower. Due to the lowered cornices, we can also clearly notice the elevation made necessary for the progressive lifting of the pavement, a phenomenon that characterizes the whole city as a consequence of the river contribution of the Centa. Inside, the descent towards the original level of the cathedral in the thirteenth century is striking. The Bell Tower , together with the Civic Tower and that of the Town Hall , has become, as a group of the three Towers, one of the symbols of the city.