There are so many ancient castles and castle ruins in our area, we probably will need years to see and explore them all! Reussenstein e.g. we just passed by accident, saw the massive, splendid walls, stopped the car and walked the path to the steep rugged rock. The view down the cliff on the valley (Neidlinger Tal) we highly recommend - for all who have the guts.
Unfortunately, I forgot my camera. Images were taken with my mobile's cheap cam.