<a href="https://en.wikipedia.org/wiki/Paderborn" class="extiw" title="en:Paderborn">Paderborn</a>, Germany: tower of the old city wall at the Kasseler Mauer
<a href="//commons.wikimedia.org/wiki/User:Zefram" title="User:Zefram">Zefram</a>
CC BY 2.5
<span class="int-own-work">Self-photographed</span>