The guarded south entrance to the Ellipse in Washington, DC.  US Capitol Police enforce partial access restrictions at this site during the US government shutdown of 2013.
<a href="//commons.wikimedia.org/wiki/User:Emw" title="User:Emw">Emw</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>