Europe, Germany, North Rhine-Westphalia, Dortmund-Boevinghausen, Zeche Zollern II-IV, now minung museum, now main entrance

travel europe germany dortmund boevinghausen europe germany industrial architecture museum of social and cultural history of ruhbergbaus north rhine westphalia ruhr area zeche zollern ii iv abandoned coal mine exterior exterior view mine now main entrance now minung museum outside structural change the ruhr area