The patron of Borgo San Siro is San Siro of Pavia, celebrated on the third Sunday of October; the village holds the Chiesa di San Siro.
Palazzo Durazzo, owned by the marquises of the same name, is the most valuable artistic building in the hamlet of Torrazza, standing in the square of the small settlement. The municipality also holds the Chiesa della Madonna del Rosario and the Fontana Marangoni.
