This cairn on Highway 21 near Port Albert, Ontario, Canada marks the location of Royal Air Force No. 31 Air Navigation School, which operated during World War II between November 18, 1940 and February 17, 1945. No. 31 ANS was a unit of the British Commonwealth Air Training Plan.
<a href="//commons.wikimedia.org/wiki/User:SteveTheAirman" title="User:SteveTheAirman">J. S. (Steve) Bond</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>