due to the turkish threat, benedictine nuns completed the construction of a fortified settlement kaštilac on the islet of gomilica in 1545. entrance to the castle is protected by high tower over the stone bridge with arches. kaštilac is away from the shore, connected with the stone bridge, which was made only of stone. fortress has square floor plan and in the past, at the entrance was located drawbridge. after the fortress was completed, within the fortification walls arrived inhabitants of the upper and lower kozica, after the turks had devastated their former villages. in the 17th century the tower lost its defensive function.