At Curraheen in County Kerry, a souterrain, an underground stone-lined passage typically built in early medieval Ireland for storage or refuge, was once recorded in enough detail to earn a formal entry in the county's monument register. When archaeologists later visited to confirm its location, they found nothing. The ground had been reclaimed, the old field boundaries removed, and whatever trace the structure might once have left on the surface had been erased entirely.

The original record rests on the work of Captain D.B. O'Connell, who noted the souterrain in 1939. Two years later, the Kerry Field Club documented it in sufficient detail that a description survives in their meeting minutes from 1941. O'Connell also marked the location on a map that is now held in the Department of Archaeology at University College Cork, which means there is a precise point in space where this feature was believed to exist, even if the landscape no longer reflects it. A further complication arises from the archival record itself: a separate letter and an extract from an Ordnance Survey six-inch map relate to a different souterrain situated further to the north-east, suggesting that at least two such structures were known in the wider area, and that the paper trail between them has become tangled over time.

There is nothing to see at Curraheen in the conventional sense, and that is precisely what makes it worth knowing about. The site sits within a landscape that has been quietly reorganised by agricultural improvement, the kind of gradual, undramatic transformation that has accounted for the disappearance of countless monuments across Ireland. The Kerry Field Club's description exists; O'Connell's map exists; the souterrain itself, as far as anyone has been able to determine, does not.