Carcassonne, the cities which has the most biggest castle wall in the Middle Ages as it is.
This castle wall is double side and was perfect to defend the attack from the outside.
This city is separated as downtown and cité. The highligts are this castle wall and cité.
From the Pont Vieux(old bridge), you can see the whole view of the castle wall.
I stayed at the hotel which is just beside the river. So, luckly, I could see the whole castle wall from the balcony.