The ringfort that once stood at Coolaboy in County Limerick does the opposite. It has vanished so completely that the ground where it stood gives no indication whatsoever that anything was ever there.

A ringfort, or rath, is one of the most common early medieval monument types in Ireland, typically a circular or oval area enclosed by one or more earthen banks and ditches, and used as a farmstead from roughly the fifth to the twelfth centuries. The example at Coolaboy was no giant of the type. When it appeared on the Ordnance Survey six-inch map of 1901, it was recorded as an oval enclosure measuring approximately twenty-five metres from south-west to north-east and around twenty metres from south-east to north-west, sitting on low-lying pasture with a farmyard complex immediately to its south. That mapping record, compiled when the monument was presumably still at least partially legible in the landscape, is now among the only evidence that it existed at all. When Denis Power inspected the site, no trace of the enclosure remained. The earthworks had been levelled and the surrounding field boundaries removed, leaving a large open field with no surface indication of what had once occupied this corner of Limerick farmland.

For anyone curious enough to visit, the low-lying pasture around Coolaboy is unremarkable agricultural land, and that flatness is precisely what made the site vulnerable; shallow earthworks on gently graded ground offer little resistance to the machinery of land improvement. There is nothing to see on the ground, which is itself the point. The 1901 OS six-inch map, accessible through the Ordnance Survey Ireland historical map viewer, remains the clearest record of the enclosure's shape and position. Cross-referencing that map sheet against the current landscape gives a reasonable sense of where the monument once stood, even if the field itself has been so thoroughly reorganised that former boundaries have also disappeared. The site sits in that melancholy category of places that archaeology records not because something survives, but precisely because it no longer does.