Gravensteen

Gravensteen Castle (Dutch: Gravensteen, literally: "castle of the count") is a medieval castle in Ghent, Belgium. It is the only medieval castle in Flanders, defensive system of which has remained virtually untouched to this day.

This is a file from www.rowing-vvr.be

The present castle was built in 1180 by Count Philip of Alsace (was Count of Flanders from 1168 to 1191). The counts of Flanders had built castles in the principal cities of the county. Because they had to maintain law and order, they continuously had to move from one city to the other. Therefore, they disposed of a castle in most cities where they wanted to stay for a few months. The castle of Ghent is the only one which survived the centuries more or less intact.

Château de Sarzay

The Château de Sarzay is a 14th century castle in the village of Sarzay in the Indre département of France. Château de Sarzay is one of the chateaus of the southern Loire Valley, which although close to a tributary of the Indre, but already adjacent to the foothills of the Massif Central. Like many buildings of this type in the Auvergne and Limousin, Sarzay had a rectangular form, flanked by 25-meter cylindrical high towers. The château was protected by two outer walls, and 38 towers. In the first period there was also a moat with three drawbridges and a 4-acre pond.

This is a file from Wikimedia Commons,

Author: Manfred Heyde, License 

Burg Steen

Burg Steen, also known as Het Steen, (Dutch: Steen, literally: "Stone") is a part of the medieval fortress on the right bank of the Scheldt River in the old city centre of Antwerp, Belgium.

This is a file from www.flickr.com, Author: mariannegreg

The castle was built between 1200 and 1225 after the Viking incursions in the early Middle Ages.  It was originally called the Antwerp Burcht (citadel). At that time, it was the first large stone building in Antwerp. Unfortunately, the building, preserved to this day, is only a small part of the old fortress. The old fortress covered an area in several times larger. Inside that castle were important institutions such as the Vierschaar (the former courthouse), St. Walburgis Church, the Fish Market, warehousing and storage facilities and a number of other buildings. The entire complex was surrounded by a massive defensive wall. The fortress made it possible to control the access to the Scheldt River and to guard the entrance to the city from the direction of the Western Scheldt.