At Rathduff in County Cork, a roughly circular enclosure measuring about 39 metres north to south and 34 metres east to west sat on a west-facing slope in pasture land for well over a thousand years before being levelled around 1973. Ringforts, known in Irish as raths, were the most common form of rural settlement in early medieval Ireland, typically consisting of a circular area enclosed by one or more earthen banks and ditches, used as a defended farmstead. By the time this one was flattened, it had already survived long enough to be mapped three times by the Ordnance Survey, appearing as a hachured circular enclosure on the six-inch sheets of 1842, 1904, and 1938.

What makes the site quietly compelling now is how much it refuses to disappear entirely. A low rise, reaching no more than 0.6 metres in height, still traces the northern, southern, and western arcs of the old enclosure. To the east, a more substantial earthen bank, standing 1.6 metres high, has been absorbed into the field's infield fence system, its original purpose rewritten as an agricultural boundary. And from the air, the whole outline becomes legible again as a crop mark, a phenomenon where buried or disturbed soil causes overlying vegetation to grow differently, revealing the ghost of a structure to aerial photography. An aerial photograph attributed to Dr D.D.C. Pochin Mould captured this outline clearly, preserving a record of the enclosure's full extent even after the ground itself had been rearranged.