<p>Grim's Dyke (1873) by Norman Shaw.  
</p>
Photo taken on a 20th Century Society tour of North London's 'Metroland' on 25th July 2009.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/98115025@N00">Steve Cadman</a> from U.K.
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/stevecadman/3782036924/">Grim's Dyke</a>