The bridge of St. Rocco over the Molgora creek is the only preserved example of medieval Lombard fortified bridge. The structure, which dates back to Roman times, was enlarged in the thirteenth century with the Porta Moriano, part of the walls of the city. In the following century the two defense towers were raised, one with a drawbridge.
Precious work of civil and military architecture of Lombardy, the bridge has a four stone arches structure, while the walls are made of river pebbles alternating bands of brick.