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Message: <blockquote data-quote="halftwo" data-source="post: 1616851" data-attributes="member: 45720">It's a marker (of various kinds) - often built of stone/concrete - but in this case a steel peg driven into the dune - which the Ordnance Survey put on a significant point (often highest points in an area) with which to measure the country and permanently mark surveying points.On Ordnance Survey maps they are marked (I think) with their height above mean sea level.So this in this case it was a convenient perch for (SE/Barn?) owls. I forgot to mention, too, there were a few trees on the dunes - an old yew, presumably grown from a dropped berry - rather incongruous; and a holly bush bent and sloped against the prevaling wind, plus a pine tree or two.The semi-wild (with many white) ponies gave the place an extra beauty & wildness too - took me back to watching that series about wild ponies on the Carmargue  - what was it called?</blockquote>