The Zollern Colliery in Dortmund is part of the Westphalian State Museum for Industrial Culture, the largest industrial museum in Germany. The former "Schloss der Arbeit" (castle of work) is one of the most appealing testimonials to the region's industrial history. Built in 1904 as one of the most modern units of its age, the colliery was closed in 1968. It owes its survival mainly to its magnificent Art Nouveau architecture, which at first glance does not even bring an industrial estate to mind. Allow yourself to be captivated by the brick façades and onion domes and take a trip back in time to the industrial age in the Museum of the Social and Cultural History of Mining in the Ruhr: you can expect an exciting insight into the heyday of mining, as well as into the everyday hard life of the miners.