Former wastewater treatment plant <i>Läppkes Mühlenbach</i> in <a href="https://en.wikipedia.org/wiki/Oberhausen" class="extiw" title="en:Oberhausen">Oberhausen</a> with clarifying tank, former machinery hall and fermentation tower
<a href="//commons.wikimedia.org/wiki/User:Tuxyso" title="User:Tuxyso">Tuxyso</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>