Here you can see a few further images
Guess what’s behind this portal.
This is the main entrance to the machinery hall of a mining company. The mine was operated from 1899 to 1955. Now, it’s a mining museum and keeps the memory to the operation years alive. They display machines, typical clothing, tools, security and heath facilities as well as habits around mining in the Ruhr area.
More of my images can be seen at my own blog.