A small fortified castle dating back to the 15th century AD, was built by Marin Radoj as part of the city's Chain Tower expansion project, which was built in the late 14th century AD. Today, the castle is used as a place where various art and historical exhibitions are held during the summer, and tourists visit it at different times of the year with the aim of climbing to the top of the castle and enjoying a charming panoramic view of the city, sea and harbor.