Fortress St. John

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Located at the south part of the city walls, served as the protector of the City Harbor. It was erected in four stages between 1346 and 1557. Its final look dates from the 16th century.

During night the city harbor was closed with a chain which was stretched from St. Ivan fortress to Kaše - the breakwater built in 15th century. Today, St. John Fortress hosts three museums. On the ground floor is the Aquarium, stocked with fish from various parts of the Adriatic Sea. On the upper floors are the Ethnographic Museum and a Maritime museum in which four sections are devoted to the Dubrovnik Republic maritime period, the age of steam, the Second World War and to the techniques of sailing and navigation.