Ha Ha, Houghton Hall Whether it was this one, I don't know, but Horace Walpole, the son of Robert Walpole who built the present Houghton Hall and laid out the park, says that one of the first gardens with a Ha Ha was his father's at Houghton, see <a rel="nofollow" class="external free" href="http://www.gardenvisit.com/t/w9.htm">http://www.gardenvisit.com/t/w9.htm</a>.
To the right is the edge of a square plantation of boxed limes planted in 1949 (this is the topiary feature mentioned in Geograph <a rel="nofollow" class="external free" href="https://www.geograph.org.uk/photo/302370">https://www.geograph.org.uk/photo/302370</a> ).
<a rel="nofollow" class="external text" href="https://www.geograph.org.uk/profile/12554">Nigel Jones</a>
From <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/photo/485946">geograph.org.uk</a>