<a href="https://en.wikipedia.org/wiki/Center_of_Advanced_European_Studies_and_Research" class="extiw" title="en:Center of Advanced European Studies and Research">Research center caesar</a>, Ludwig-Erhard-Allee 2, <a href="https://en.wikipedia.org/wiki/Bonn" class="extiw" title="en:Bonn">Bonn</a>-Hochkreuz: viewing direction north
<a href="//commons.wikimedia.org/wiki/User:Hasenl%C3%A4ufer" title="User:Hasenläufer">Eckhard Henkel</a>
CC BY-SA 3.0 de
<span class="int-own-work" lang="en">Own work</span>