St John's Fortress /Maritime Museum /Aquarium. On the eastern part of the city stands the monumental fortress of St Ivan. Its present form was gained in 16th century and its basic function was the protection of the city port and the sea approaches to Dubrovnik. A much older fort from the 14th century existed on the same spot. The fort was reconstructed by the famous Dubrovnik builder Paskoje Milicevic. Towards the sea, the fortress has smooth and slightly curved walls, while the part of the walls facing the port is smooth and vertical. Today the fortress houses the Maritime Museum that features a number of exhibits from Dubrovnik's rich maritime history. In the lower part of the fort there is an Aquarium with a rich collection of fish, shells, crabs and corals.

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