The old hydroelectric power plant in Rheinfelden
<a href="https://en.wikipedia.org/wiki/de:User:Wladyslaw_Sojka" class="extiw" title="w:de:User:Wladyslaw Sojka">Wladyslaw Sojka</a> at <a href="https://en.wikipedia.org/wiki/de:" class="extiw" title="w:de:">German Wikipedia</a>
CC BY-SA 3.0
Selbst fotografiert (selfmade).