Introduction to the Porte de Saint-Jean: The Porte de Saint-Jean is directly opposite the road leading to Paris. It is a fortress used to resist foreign invasion. This is reflected from the tall beacon towers on the left and right and the stretching It can be seen on the city wall. The city wall built since the Middle Ages has been damaged by wind and rain. After major repairs, it has basically restored its original appearance, but the color of the brick wall has never been able to blend with the past.