Thanks Frank and Andrea,
the castle in the second shot is the same as the one in front of the fog of the first shot. The one behind the fog, a little bit higher are the ruins of castle Drachenfels, which is much older.
Her are few shot from up there (Drachenfels), taken with my newest old lens I found on a camera flee market last weekend, a mirror Nikkor 500mm f8 latest edition:
(The two last shots are from the same raw file, just before and after PS ;-) )