Sigmaringen castle at night, Upper Danube nature park, Danube river, Baden-Wuerttemberg, Germany

sight trees natural preserve baden wurttemberg architecture europe landscape nature landmark illumination sigmaringen baden wuerttemberg historical buildings beauty in nature travel scenics swabian alp natural beauty castle evening water landmark dusk outdoors travel destination tree night tranquil scene nature reserve park river sigmaringen castle national landmark danube reflection germany upper danube nature park