Even though Croatia is a country with rich marine life and beautiful seas, it has few aquariums. The one in Dubrovnik is probably the best known, even though it΄s very small and modest compared to other aquariums you may have visited. But it definitely has a unique setting within the old fort so for that it is worth a visit. It is also a very nice place for children. Once you are in Old City harbour walk towards the St John fort and to your right you will see a sign. Follow it through the passage in the walls and you will see the entrance to your left.