Gutenfels Castle and Pfalzgrafenstein Castle, UNESCO World Heritage Site, Upper Middle Rhine Valley, Kaub, Rhineland-Palatinate, Germany Gutenfels Castle and Pfalzgrafenstein Castle, UNESCO World Heritage Site, Upper Middle Rhine Valley, Kaub, Rhineland-Palatinate, Germany Gutenfels Castle and Pfalzgrafenstein Castle, UNESCO World Heritage Site, Upper Middle Rhine Valley, Kaub, Rhineland-Palatinate, Germany Gutenfels Castle and Pfalzgrafenstein Castle, UNESCO World Heritage Site, Upper Middle Rhine Valley, Kaub, Rhineland-Palatinate, Germany