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.

The Saint-Gimer Church is located in the Barbacane district at the foot of the city. Deified in the 19th century, from 1854 to 1859, by Viollet-Le-Duc in the center of the ancient Barbican of Aude, the Church owes its name to Saint Gimer, Bishop of Carcassonne from 902 to 931 who was known for his charity towards the poor. Its architecture, characterized by the Gothic vision of the famous architect, encloses the furniture from the early church.

This cathedral was built in 1247 on the orders of Saint Louis, to replace a sanctuary destroyed 7 years earlier during a siege of the city. A fire in 1849 slowed down the work undertaken to transfer the seat of the bishop.