Basilique Notre-Dame-de-la-Trinité

The construction of this cathedral took a very long time, since it began in the 12th century, but was not completed until six centuries later, in the 18th century. Several campaigns of work follow one another, mixing several architectural styles.

The church of St Saturnin was built between the 10th and 11th centuries as a modest place of worship. It was not until the 15th and 16th centuries that it became an important place of worship, when the church acquired a miraculous statue of the Virgin, making it an important stop on the Way of St. James. At the beginning of the 16th century, Queen Anne of Brittany undertook reconstruction work on the church, but this was interrupted when she died in 1514. During the Wars of Religion, Protestants set fire to the building's roof structure in 1568. A reconstruction project at the beginning of the 16th century was set up and completely changed the style of the church with the creation of groin vaults between 1570 and 1578.

The church of St. Nicholas-St. Laumer is a Romanesque church that was originally the abbey church of a monastery built in the 11th century. It is named after the founder of the abbey, Saint Laumer. Its construction began in the 11th century. The choir, transept and the first bay of the nave were built between 1138 and 1186. The church was completed in the early 13th century. The church was an important place of pilgrimage in the Middle Ages. It houses several relics: Saint Lubin, Saint Laumer, Saint Mary the Egyptian and a fragment of the cross of Christ.