The Max Planck Institute for Radio Astronomy in Bonn (main entrance). The southern wing to the left (with yellow front) belongs to the <a href="//commons.wikimedia.org/wiki/File:AIfA_Bonn.jpg" title="File:AIfA Bonn.jpg">Argelander-Institute for Astronomy</a> of the University of Bonn.
<a href="//commons.wikimedia.org/wiki/User:SiriusB" title="User:SiriusB">SiriusB</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>