It is absolutely impossible to overlook the castle Felsburg at Felsberg, Germany. It sits on a basaltic cone next to the city and is nearly 30 meters high. First mentioned in the year 1060 CE it was built to protect the strategically important passage through river Eder which was part of an important inner-German trade channel. The castle is in good shape and you can climb up on different paths to take a look at it.
During opening hours you can visit the donjon and the courtyard – but even if it is closed it is nice to walk along the walls and enjoy views onto the city underneath. On the reverse side of the castle there is a small parking area and you can take a steep path up from there. On the way you can also find a stage which is used for cultural events.