A field in Ballyhahill, County Limerick, belongs to that category. What was once a rath, a type of circular earthen enclosure built during the early medieval period and used as a farmstead or place of settlement, has been effectively erased from the landscape. The ground where it stood is now uneven pasture, its irregularities more suggestive of industrial disturbance than ancient habitation.

The ringfort was recorded on the Ordnance Survey six-inch map of 1840 as an embanked circular enclosure roughly forty metres in diameter, the kind of modest but legible earthwork that was once common across the Irish countryside. By the time the OS returned to map the area in 1923, something else had arrived: a small quarry operating on the same ground. Quarrying and ringforts have rarely coexisted well, and here the result was the effective destruction of the monument. The quarry itself is now gone too, grassed over, leaving a north-facing slope in pasture that gives little indication of either the early medieval enclosure or the later industrial activity that removed it. The record was compiled by Denis Power and uploaded to the national monuments database in August 2011.

Visitors with a specialist interest in landscape archaeology might find the spot worth locating, though the experience will be one of reading the ground rather than observing any obvious structure. The unevenness Denis Power noted is likely the most visible sign that something happened here, the slight humps and hollows that result when quarried ground is left to consolidate and turf over across decades. The site sits on a gentle slope, which may itself have been part of the original appeal for whoever built the rath, offering modest drainage and an outlook to the north. There is nothing to see in the conventional sense, but for those accustomed to looking at early Irish settlement patterns, the absence of the monument is itself part of the record.