Basilica of Saints Nazarius and Celsus
Carcassonne , FR
This church was built between the 9th and 14th centuries, completed in 1330. The building was renovated in the 19th century under the direction of Viollet-le-Duc. It offers a clever mix of Gothic architecture and Romanesque architecture. Its prominence in the landscape of the medieval walls earned it the nickname "Jewel of the City".