The Château-Vieux ('Old castle') in Bayonne is built on the site of an ancient Roman castrum which housed the garrison and administration of the region. From the end of the 11th century the viscounts of Labourd built the fortress based on three existing Roman towers strengthened. The castle was refortified in the 17th century by Vauban plans.
The Château Comtal (Count’s Castle) is a medieval castle within the Cité of Carcassonne, the largest city in Europe with its city walls still intact. The Château Comtal has a strong claim to be called a 'Cathar Castle'. When the Catholic Crusader army arrived in 1209 they first attacked Raymond-Roger Trencavel's castrum at Bèziers and then moved on to his main stronghold at Carcassonne.
The castle with rectangular shape is separated from the city by a deep ditch and defended by two barbicans. There are six towers curtain walls.
The castle was restored in 1853 by the architect Eugène Viollet-le-Duc. It was added to the UNESCO list of World Heritage Sites in 1997.