A No Photography Sign at Munich Hauptbahnhof Construction. Taken from a public space, should be covered by freedom of panorama.
<a href="//commons.wikimedia.org/wiki/User:Aveaoz" title="User:Aveaoz">aveaoz</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>