Aerial photograph at Birkenau with BIIb (orange) and BIId (pink) highlighted
<a href="//commons.wikimedia.org/wiki/User:Buidhe" title="User:Buidhe">Buidhe</a>
<span class="int-own-work" lang="en">Own work</span> (derivative of <a href="//commons.wikimedia.org/wiki/File:Auschwitz_aerial_view_RAF.jpg" title="File:Auschwitz aerial view RAF.jpg">File:Auschwitz aerial view RAF.jpg</a>)