brohltal with niederdürenach and oberdürenbach, seen from burg olbrück

hill mountain terrain plateau cliff coast road landscape highway plain reservoir infrastructure transport landmark tower field waterway fortification burg olbrück ruin eifel located brohltal kreis ahrweiler hilltop castle built 1100 public memorial village hain niederdürenbach one castles northern vulkaneifel early spring knights medieval history historic fortress fort castel green valley wind power hills bridge niederdürenach oberdürenbach