Placement of <a href="//commons.wikimedia.org/wiki/Berlin_Wall" title="Berlin Wall">Berlin Wall</a> and the border of West Berlin before 1989.
<a href="//commons.wikimedia.org/wiki/User:Sansculotte" title="User:Sansculotte">Sansculotte</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>