Still Laid coal mine in the northwest of the city of Dortmund. Zollern emerged from 1898 as a model coal mine in the Gelsenkirchen Mining-AG. Since 1981, integrated into the decentralized Westphalian Industrial Museum. The colliery was the first industrial monument in Germany
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/69460501@N04">Heribert Pohl --- Thanks for half  a million clicks!</a> from Germering bei München, Bayern
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/poly-image/13620962675/">Dortmund, Industriemuseum Zeche Zollern -- Haupteingang der Maschinenhalle (Main entrance of the machine hall)</a>