Carcassonne, kahr kah SAWN (pop. 46,216), is a city in southern France that includes one of the finest examples in Europe of a medieval walled town. The walled town lies southeast of the rest of the city. Two walls, both including towers, surround the southeastern section. Landmarks within the walls include the Cathedral of St.-Nazaire, which dates from the 1000's, and the Chateau Comtal, a castle built in the 1100's. Many tourists visit Carcassonne to see its medieval structures. Carcassonne serves as the capital of the Aude department (administrative district). It is a center of the wine trade of its region. Other economic activities include oil refining and the manufacture of furniture, plastics, and rubber products.