Map of the Underground system of St. Petersburg, Russia
<a href="//commons.wikimedia.org/wiki/User:Fremantleboy" title="User:Fremantleboy">Fremantleboy</a> 28 July 2007 (UTC), updated version by <a href="//commons.wikimedia.org/w/index.php?title=User:WWay&amp;action=edit&amp;redlink=1" class="new" title="User:WWay (page does not exist)">User:WWay</a>
CC BY 2.5
own work / selbst hergestellt