6 euros gets you admittance to the castle ruins which are quite extensive. The views from the castle looking down on the valley below are breathtaking. There are areas above and below to explore. The spaces involved are larger than imagined but also smaller underground. The castle dates back to 1245. Across the Rhine and all up and down the valley there are many more castles crowning the hilltops. Many are within visual distance of each other. There is a castle tour that takes you to at least 7 of them. read more