Carcassonne is a hilltop town in southern France's Languedoc area, well-known for its medieval citadel, La Cité. The First Walls, founded in Gallo-Roman times, protect this old town with 53 watchtowers, barbican, and double walls. The town also includes a cathedral known as Cathédrale Saint-Nazaire. It's a charming place with cobblestone streets and quaint houses.