Rinkesta Castle is a castle at Eskilstuna Municipality in Södermanland. Rinkesta was withdrawn from the crown in 1594 through a change to Privy Councillor (Kammarråd) Gustaf Gabrielsson Oxenstierna (1551-1597). The main building was repaired after a fire in 1698. The current appearance was given to the castle during an extensive repair in 1775, during the ownership of Swedish Supreme Court marshal (Överstemarskalk) Thure Leonard Klinckowström (1735-1821) who acquired the estate in 1768.
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.