The walls are a UNIVERSAL monument. We all have an image of this great milestone in military architecture that has become a milestone in the history of art.
It comes as no surprise that the walls are admired for their grandeur and spectacular appearance: the perimeter measures 2516 m in length and there are 87 turrets and 9 gates. Their elevation is finished off with no fewer than 2500 merlons (a merlon is the part of the parapet between two crenels).