3Carcassonne, France
The medieval fortress of Carcassonne is a stunning example of defensive architecture in Europe. Located in the Languedoc region of France, Carcassonne dates back to Roman times, but its most notable features were built during the Middle Ages. The fortress is surrounded by a double ring of walls, punctuated by 52 watchtowers, making it one of the most well-defended medieval cities in Europe. Inside the walls, the village retains its medieval charm, with narrow streets, historic buildings, and a 12th-century basilica. The restoration of Carcassonne in the 19th century ensured that this remarkable fortress would continue to stand as a symbol of medieval military prowess.