Engine House of the Wallfisch Mine in Witten, converted to a residential building.<br>
(Image modified: roation, perspective distortion reduced, contrast, colors.)
<a href="//commons.wikimedia.org/wiki/User:Pentachlorphenol" title="User:Pentachlorphenol">Pentachlorphenol</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>