The <i>Klever Tor</i> in Xanten. 
<p>Xanten  is a historic town in the North Rhine-Westphalia state of Germany.
</p>
While to the North East the Rhine and to the South and West marshy terrain provided protection, the northen walls were reinforced by inter al. the <i>Klever Tor</i>.
<a href="//commons.wikimedia.org/wiki/User:AdMeskens" class="mw-redirect" title="User:AdMeskens">Ad Meskens</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>