Dortmund <a href="https://en.wikipedia.org/wiki/de:Hohensyburg" class="extiw" title="w:de:Hohensyburg">Hohensyburg</a>, <a href="https://en.wikipedia.org/wiki/de:St._Peter_zu_Syburg" class="extiw" title="w:de:St. Peter zu Syburg">Sankt Peter Syburg</a>
<a href="//commons.wikimedia.org/wiki/User:Rainer_Halama" title="User:Rainer Halama">Rainer Halama</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>