In a field near Prumpelstown in County Kildare, something circular lies buried just beneath the surface of a working landscape, invisible to anyone standing in it yet perfectly legible from the air. A single aerial photograph, catalogued as CUCAP BGH 49, caught it as a cropmark, the kind of ghostly outline that appears when buried features cause the vegetation or soil above them to grow differently to their surroundings, betraying the presence of a fosse, a defensive or boundary ditch, describing a rough circle roughly twenty-five metres across at its widest point.

The site is tentatively identified as a ringbarrow or ringditch, two related monument types associated with prehistoric funerary practice. A ringbarrow typically consists of a low central mound enclosed by a circular ditch, sometimes with an outer bank, while a ringditch may represent the eroded remains of such a monument, where the mound itself has long since been ploughed flat and only the surrounding fosse persists in the subsoil. Either way, what the photograph captured is likely the trace of a burial monument, perhaps several thousand years old, now reduced to an impression in the earth. It does not stand alone; a second enclosure of similar character lies approximately a hundred metres to the south-west, the two sites sitting quietly alongside one another in the same stretch of farmland, their relationship to each other unknown.