This one, in the townland of Milltown in the barony of Coshma, County Limerick, has left almost nothing at all, and what little it may once have offered is now visible only in a single aerial photograph taken over forty years ago. It is, in the strictest sense, a place that exists primarily as a question mark in a field.

The site came to light during analysis of aerial photography commissioned by Bórd Gáis Éireann in connection with a gas pipeline survey. The photograph in question, catalogued as BGE 1/10,000, sheet 60, was taken on 3 November 1984, and shows what appears to be a small circular earthwork in reclaimed pasture. Circular earthworks of this kind are common enough across Ireland and can range from ringforts, which were enclosed farmsteads typically dating from the early medieval period, to ring barrows associated with prehistoric burial. Whether this particular feature belongs to either tradition remains unclear. It does not appear on Ordnance Survey Ireland historic mapping, which suggests it was either not recorded during earlier survey campaigns or was already too degraded to attract notice. More tellingly, by the time more recent satellite imagery became available, including Digital Globe and Google Earth orthoimages examined after the record was compiled by Fiona Rooney and uploaded in June 2021, no surface trace of the feature remained visible at all.

For anyone curious enough to visit the general area around Milltown in this part of County Limerick, there is honestly very little to see on the ground. The land has been reclaimed and worked as pasture, and without the 1984 aerial photograph as a reference, there is no obvious way to locate even the approximate position of the feature. The interest here is less in the site itself than in what it illustrates about how archaeological evidence survives, or fails to: a faint cropmark or soil shadow caught on a single November morning, recorded in a pipeline survey archive, and now preserved only as a database entry. It is a reminder that the landscape holds more history than is legible from the surface, and that much of what once existed has already crossed the threshold into near-total invisibility.