At the southern end of the Seehofweiher is the Ritterstein No. 29 "Former lead ore mine". A very small mouth hole can still be seen, which was probably a much larger tunnel entrance in the past.
Not far from the Siegfried Line, two bunker tunnels were created in the rock. They served as a medical station in World War II. A large board shows the size of the tunnels. They are locked and cannot be entered.