The old roundhouse in <a href="https://en.wikipedia.org/wiki/en:Gelsenkirchen" class="extiw" title="w:en:Gelsenkirchen">Gelsenkirchen</a>-Bismarck, Germany.
<a href="//commons.wikimedia.org/wiki/User:Bubinator" title="User:Bubinator">Stefan</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>