Once impregnable, now this castle on the cliff above the confluence of the Ruhr and Lenne rivers is the romantic ruins of the walls and well preserved tower. The castle was built at the beginning of the XII century for the feudal Syburg family on the site of the ancient fortifications, which had emerged there 400 years earlier. Already in the XVII century the castle that was destructed and reconstructed, was abandoned and began to crumble. In the middle of the XIX century, a 26 meters high octagonal tower was added to the castle. It was named Vincketurm after the Prussian politician Karl-Friedrich von Vincke. He was married to a girl from the Syiburg family, owners of the castle, but he never reconstructed it. The same-name Hohensyburg casino is near the castle.