This happens to be one of the oldest castles in the entire world. It is situated on a fifty meter high hill that is in the center of Aleppo in Syria. Research suggests that the usage of the hill by humans began at least in the middle of 3rdmillennium BC. The castle has been occupied by Greeks, Byzantines, Ayyubids and Mamluks since it was built. The majority of what you see as a structure dates back to the thirteenth century. So, if you visit it, what you will see are preserved remains of thirteenth century castle; should be good. It covers an area of 39,804 square meters.