The patroness of Francavilla Bisio is Our Lady of Graces, celebrated on 21 May. The parish church dedicated to her, from 1950, has a red-brick façade that deliberately echoes the motif of the castle overlooking the town.
The settlement is indeed dominated by the Guasco castle, built around a tower already present in the 10th century but subject to later enlargements: its present appearance, though of medieval layout, is the result of 19th-century remodelling.
