Map of Berlin's underground line U3
<p><a href="https://de.wikipedia.org/wiki/Benutzer:S._Gollin" class="extiw" title="de:Benutzer:S. Gollin">Sebastian Gollin</a>
</p>
The original uploader was <a href="https://en.wikipedia.org/wiki/de:User:S._Gollin" class="extiw" title="w:de:User:S. Gollin">S. Gollin</a> at <a href="https://en.wikipedia.org/wiki/de:" class="extiw" title="w:de:">German Wikipedia</a>.
CC BY-SA 3.0
own work, openstreetmap background