Pfalzgrafenstein Castle, Gutenfels Castle in background, near Kaub, River Rhine, Germany, Europe

photography colour colour image color color image vertical vertical image day outdoors outside nobody no one no one travel travel destination travel destinations kaub pfalzgrafenstein castle gutenfels castle river rhine germany german europe european landmark landmarks famous well known well known castle fort forts fortified fortification fortress fortresses building exterior building buildings architecture architectural 14th century river water elevated view riverside facade medieval