The circular enclosure at Ballygarret, in north County Kerry, belongs to that category. When surveyors working on the Ordnance Survey mapped the area in 1841 and 1842, they recorded it clearly enough: a circular enclosure, the kind of roughly ringfort-shaped earthwork that appears in the hundreds across the Irish countryside, typically the remains of an early medieval farmstead enclosed by a raised bank and ditch. By the time the next comparable survey came around in 1915, it had vanished from the record entirely. No surface trace survives today.

What happened in the intervening decades is not difficult to reconstruct in outline, even if the particulars are gone. The Listowel to Duagh road was already cutting through the northern sector of the enclosure by the time the 1841 map was drawn, which suggests the site was already under pressure from the expanding road network of the nineteenth century. The road did not simply pass near it; it bisected it. Whatever earthworks remained after that intervention were apparently gone within a few generations, levelled by the gradual work of agriculture and time. The enclosure at Ballygarret is, in a quiet way, a record of how comprehensively the ordinary infrastructure of the modern period could erase what had survived for perhaps a thousand years beforehand.