Water Supply
To this day, the mode of water supply to the upper fortress during the Middle Ages remains unknown. Excavations did not uncover any trace of a fountain or a cistern in the upper fortress.
It is highly unlikely that the need for water was satisfied by carrying it up the eastern bluff. It seems plausible that crane systems stretched out over the walls, lifting barrels and foodstuff up to the castle. The most probable method: today the so-called Brunnenhaus (well house) still stands in in the courtyard of the lower fortress, at the southeastern foot of the tower gate of the upper fortress. It is possible that the building was higher in earlier times, stretching all the way to the plateau of the upper fortress, and that all necessaries were transported upward in its interior.