<a href="//commons.wikimedia.org/wiki/Beamish_Museum" title="Beamish Museum">Beamish Museum</a>, County Durham, England. Danger sign, warning of an old colliery shaft. It's presumably sited somewhere in the <a href="//commons.wikimedia.org/wiki/Beamish_Museum:_Colliery" title="Beamish Museum: Colliery">Colliery</a>.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/87347455@N00">Chris Sampson</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/lodekka/7344734794/">110412-039 CPS</a>