Basilica of Saints Nazarius and Celsus
The church, formerly a cathedral, was consecrated in 1096 by Urbain II, although it was not completed. The nave dates from this Romanesque period. The construction of the transepts was completed in the 13th century, when the choir was also built, and its roundabout was added in the 14th century. The Romanesque portal was completely rebuilt in the 19th century during the restoration of Viollet-le-Duc.