St Michael's fortress was built on a steep hill 60m above sea level, overlooking the estuary of the Krka river. The medieval fortress is the hearth of a town which was mentioned for the first time in 1066. That year the Croatian king Petar Krešimir IV spent some time in Šibenik. On the fortress you can see that it was constructed between the 13th and 18th century but most of it dates back from the 15th/16th century. According to its layout , it is an irregular square. The main gothic entrance is on the eastern side. Inside the fortress there are 2 water tanks, which were used by the soldiers. The other necessary chambers like bedrooms, storages and similar rooms are not preserved. St Michael's church, dating back as far as the 12th century, was inside the fortress. St Michael's Fortress Revitalization Project includes the renovation of the fortress and the construction of a summer stage with 1077 seats. This makes the fortress a recognizable monument of the cultural heritage. It is accessible to the visitors and it promotes cultural tourism by organizing different cultural, musical and stage events.