Burg Blankenstein is a castle located on the south site of the river Ruhr in Hattingen, North Rhine-Westphalia, Germany.
The castle was built in 1227 by the Counts of the Mark. In 1614, shortly before Thirty Years' War, it was occupied by Spanish troops.
The property has belonged to the city of Bochum since 1922, but the town is looking for an alternative due to the costs.
The tower can still be visited and offers a good view over Bochum and the Kemnader See.