Bočac Fortress is located on the left bank of the Vrbas River, on the half of motorway E661, between Banja Luka and Jajce. It was built in the early 15th century on a rock, in order to defend the crossing over the Vrbas River. The Fortress was mentioned for the first time in a charter from 1448. From 1463 to 1527, when it fell under the Ottoman rule, the city used to be the fortification of the Banovina of Jajce. In the early eighteenth century, Bočac was mentioned as a settlement with a few cannons. It was abandoned before 1833. During the Ottoman occupation it was subsequently fortified and maintained and the fortified walls and towers that surround the large garden of the town are relatively well preserved today.
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.