This fortress is an extension of the city walls. You must climb and walk the city walls while you are in the old city as you will enjoy great views of the old city and the harbor. While there, you might want to continue on top of the Fortress.

We visited the Old Town of Dubrovnik for a walk. A fort located at the southeast end of the wall. It is said to be an important defence to protect the old harbour, which was once crowded with many trading ships, and started construction in the 14th century and was later upgraded to become a combined fortress in the 16th century. The walls facing the sea are round, and the part facing the port is a flat vertical wall (which was under construction and sheeted when I visited). There is now an aquarium on the ground floor and a maritime museum on the first and second floors, but I passed because I was on the verge of making time for the rampart walk.

Fort St. John is located in the old harbour, protecting and controlling the entrance of the city. This iconic fortress today houses the Maritime Museum and the Dubrovnik Aquarium. Massive construction, round and thick, served as control the passage of ships to the port. Today it is a tourist Attraction and allows many beautiful photos, from various angles. Entrance is paid and is included in the Vacation Package to visit the walls. It is worth going around outside the Forte, outside the walls.