At Ballycullane in County Limerick, an Ordnance Survey map from 1923 records a circular earthwork roughly sixty metres across, its raised bank tracing a near-perfect ring across the undulating pasture. That enclosure, a rath or ringfort of the kind built in early medieval Ireland as a defended farmstead or high-status homestead, is no longer visible on the ground. In its place stands a piggery.

Ringforts are among the most common archaeological monument types in Ireland, with tens of thousands recorded across the island, yet individual examples disappear with dispiriting regularity. The 1923 six-inch Ordnance Survey map, part of a revision series that documented field monuments with reasonable care, captured this one at Ballycullane at a moment when it was still legible in the landscape, its embanked perimeter presumably still rising above the surrounding ground. At some point between that survey and the present, the earthwork was levelled, the land repurposed, and the physical record erased. Denis Power compiled the site record, uploaded in August 2011, by which point the monument was already gone.

For a visitor, there is little to see at the site itself, and that absence is more or less the point. The surrounding land is described as undulating pasture, the kind of quiet agricultural ground that once held dozens of such monuments across the Limerick countryside. The value of coming here, if one does, is less about direct encounter and more about reading the gap between map and reality. Bringing a copy of the 1923 OS sheet, or consulting the digitised version through the OSI historical map viewer, allows the eye to place the vanished enclosure within the current field pattern. Sometimes the faint logic of an old boundary or a subtle rise in the ground can still suggest where an earthwork once stood, though no such trace is documented for this particular site.