Built between the twelfth and thirteenth centuries on Romanesque style, on the Via Francigena, dedicated to San Donnino, it was built at the point where, according to legend, the Saint was did. The direction of the works and the sculptures were by Benedetto Antelami. The most important part is the facade, one of the most beautiful of the Emilia Romagna, featuring bas-reliefs telling the story of St. Donatus and the statues of David and Ezekiel. The two lions guarded at the main entrance and decorative arch of the door are remarkable. The facade is unfinished at the top. The interior is divided into three toothed naves and two imposing matrons. The right nave features the addition of a 15th century chapel containing the baptismal font. In the crypt under the altar, the bones of the martyr are preserved. At one time the interior was decorated, but original frescoes remained just the face of a prelate in the apse area, the rest was lost when in the seventeenth century when the lime was removed from the walls to prevent plague contagion. Cathedral has three bell-towers, two on the sides of the facade and one on the side of the apse.