rheinfels castle near village of sankt goar at rhine river,middle rhine valley, rheingau, rhineland-palatinate, germany

architecture attraction building burg castle clouds destination europe fortification fortress gate germany goar goarshausen gorge green heritage hill historical landmark landscape medieval middle mountain old rhein rheinfells rheinfels rhine rhineland rhinelandpalatinate river rock romantic ruin schloss site stone tourism tower town travel unesco valley village vineyard wall wine