This sign is at the main entrance to the privately owned site that is home to the former US listening station on Teufelsberg, Berlin. it lists the opening hours for the site: 10am to "one hour before sunset."
<a href="//commons.wikimedia.org/w/index.php?title=User:Sarahmirk&amp;action=edit&amp;redlink=1" class="new" title="User:Sarahmirk (page does not exist)">Sarahmirk</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>