A group of 3 cannons on the Sveti Ivan tower.
"St. John Fortress
The St. John Fortress (Croatian: Sveti Ivan), often called Mulo Tower, is a complex monumental building on the southeastern side of the old city port, controlling and protecting its entrance. The first fort was built in the mid 14th century, but it was modified on several occasions in the course of the 15th and 16th centuries, which can be seen in the triptych made by the painter Nikola Božidarevic in the Dominican monastery. The painting shows Saint Blaise, the patron saint of Dubrovnik. Dominant in the port ambiance, the St. John Fortress prevented access of pirates and other enemy ships. Always cautious at the first sign of danger, the inhabitants of Dubrovnik used to close the entry into the port with heavy chains stretched between the St. John Fortress and the Kase jetty, and they also used to wall up all the port entries to the Great Arsenal.
Today, the fortress houses an aquarium on the ground floor, stocked with fishes from various parts of the Adriatic Sea. On the upper floors there is an ethnographic and a maritime museum devoted to the Republic Maritime Period, the Age of Steam, the Second World War, and the section of techniques of sailing and navigation."
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There is a fee of 100 Kuna to walk around the walls. Open 08:00 to 18:00