It has never been excavated, never signposted, and most people walking past it would have no idea it was there. What gives it away, at least to those equipped to look, is the faint trace of a ring ditch, a roughly circular trench cut into the earth, typically associated with prehistoric funerary or ceremonial activity, often the remnant of a burial mound whose raised earthwork has long since been ploughed or eroded flat.

The site came to light in 2005, when a geophysical survey carried out under Licence no. 05R023 detected sub-surface remains at Thorntown. The survey, recorded by M. Clinton and compiled by Geraldine Stout, measured the ditch at approximately ten metres in diameter. Geophysical survey works by reading variations in the soil, picking up disturbances caused by ditches, walls, or pits that have been filled in over centuries and are now invisible at ground level. In this case, the technique revealed a feature sitting quietly beneath the ridge top, its circular form intact enough to be mapped even without a single sod being turned.

Because the site exists entirely below the surface, there is nothing to see in any conventional sense. The ridge at Thorntown is under pasture, and the ring ditch itself gives no surface expression. A visitor curious enough to seek the area out would be looking at an ordinary field, with the knowledge that something ancient is preserved a short depth beneath their feet. The value here is perhaps less about the view and more about what geophysical survey has made possible: the ability to identify and record a buried site without disturbing it, leaving open the possibility that future excavation might one day reveal whether this was a place of burial, ritual, or something else entirely.