bad ems, quelleturm with bismarkturm in background

building tower estate castle landmark monastery house church chapel tree town tourism village steeple fortification bad ems tracks kurwaldbahn located lahn valley recognized unesco world heritage 2021 one 'great spa towns europe' 18th century popular prussian dutch russian aristocrats royal history connected visible monuments shaped like canal parts historic classic buildings including hotels casino called 'spielbank' german language quelleturm bismarkturm background