Château de Carros is a jewel of 12th century Provençal architecture, characterized by a rectangular main building with four towers in the corners. The first owner was Lord Rostaing de Carros (mentioned 1156), but soon after the castle was moved to the hands of De Placas family who owned it over 600 years. Since 1998 the castle has housed CIAC, International Center of Contemporary Art.
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.