Cité de Carcassonne

Founded during the Gallo-Roman period, the citadel derives its reputation from its 3 kilometres (1.9 mi) long double surrounding walls interspersed by 52 towers. The town has about 2,500 years of history and has been occupied in different ages by Romans, Visigoths, and Crusaders. At the beginning of its history it was a Gaulish settlement; in the 3rd century CE, the Romans decided to transform it into a fortified town. The Roman defences were in place by 333 CE, when the town is described as a castellum.

Bernard Aton IV Trencavel, vicomte of Albi, Nîmes, and Béziers, introduced a period of prosperity for the city with numerous construction projects. During this period, a new sect known as Catharism sprang up in Languedoc. In 1096, the Viscount of Trencavel authorised the construction of the Basilica of Saint-Nazaire with the blessing of Pope Urban II. In 1107, the citizens rejected his sovereignty and called on Ramon Berenguer III, Count of Barcelona to remove him. Bernard Aton V, with the help of Bertrand, Count of Toulouse, regained control of the Cité.

In 1659, after the Treaty of the Pyrenees, the province of Roussillon became a part of France and the town lost its military significance. Fortifications were abandoned and the town became one of the economic centres of France, concentrating on the woolen textile industry. In November 1793, the Revolutionary town council burned the Cité's archives and in 1804 Napoleon officially demilitarized the fortress, turning over ownership of most of the fortifications to civil authorities.