aerial view of markburg medieval castle above braubach germany with tall keep rising above the rhine

weaponry walls views valley unesco undefined travel towers tours tourist tourism timber tentative structure stone siege romanesque river rhine residential renaissance ramparts preservation panoramic museum military middle medieval marksburg loreley list life landmark koblenz knights kitchen interior influences history historical hilltop heritage hall guided grounds great gothic gorge germany german gatehouse gardens framing fortress fortifications feudalism european dungeon drawbridge destination defensive cultural courtyard chapel castles castle burg attraction armory architecture