Hammerstein castle
Hammerstein Castle (Burg Hammerstein) is the ruin of a 10th-century mountain castle in Rhineland-Palatinate, Germany, the oldest in this entire Middle Rhine Valley. The ruin of one of its watchtowers still overlooks the Rhine at an altitude of 195 m, near the village of Hammerstein. The Rheinsteig hiking trail passes close to the ruins which can be reached via a small path.