That unremarkable-sounding combination is, in its own way, a small puzzle: a ringfort, a type of circular earthwork settlement used extensively in early medieval Ireland, repurposed at some point by later inhabitants who saw in its raised platform not a relic to be preserved but a convenient piece of ground to cultivate.

Ringforts, known in Irish as raths, were typically defined by an earthen bank and a fosse, or external ditch, enclosing a farmstead. The Piercetown example is a slight variation on that pattern. When an Office of Public Works inspector visited in January 1973, they recorded a circular enclosure roughly 36 paces across, sitting on a low natural rise in undulating pasture at between 200 and 300 feet above sea level. What they found was a platform about two feet high, its outer edge dropping sharply and partly revetted with dry stone, but with no fosse and no proper bank in the conventional sense. A thorn hedge ran around the perimeter, and a scattering of boulders along the edge was interpreted as stone cleared from the surrounding land. The inspector's assessment was cautious but pointed: this was presumably a small ringfort that had been partly reused as a small garden. The 1837 Ordnance Survey six-inch map had already shown it as an oval tree-lined enclosure, and by the revised 1913 twenty-five-inch edition it appeared as a circular enclosure of approximately 25 metres in diameter, suggesting that successive generations of mapmakers found something worth recording here, even if they couldn't quite agree on its shape.

The site was added to the Register of Historic Monuments, published in Iris Oifigiúil, on 11 February 1975, giving it a degree of formal protection. Aerial imagery continues to show the enclosure as a tree-lined circle in the pasture, its outline still legible from above even as its ground-level details have softened with time.