<a href="https://en.wikipedia.org/wiki/Flight_93_National_Memorial" class="extiw" title="w:Flight 93 National Memorial">Flight 93 National Memorial</a>, Stonycreek Township, Pennsylvania, USA, memorial sign, fighting back
sign by <a href="https://en.wikipedia.org/wiki/National_Park_Service" class="extiw" title="w:National Park Service">NPS</a><br>photograph of sign by <a href="//commons.wikimedia.org/wiki/User:Brian_W._Schaller" title="User:Brian W. Schaller">Brian W. Schaller</a>
<span class="int-own-work" lang="en">Own work</span> - photograph of a public domain sign