The word "may" is doing considerable work here. By the time anyone looked closely, the evidence had already been erased.

The story is a short one, and an instructive one. A cashel, which is a circular stone enclosure used in early medieval Ireland to enclose a farmstead or settlement, once stood at Drumharsna. Within its western half, surveyors visiting in October 1982 noted a stone-filled hollow that corresponded, at least loosely, with a souterrain recorded by a researcher named McCaffrey in 1952. The hollow was tentative evidence at best, a depression in the ground hinting at something beneath rather than confirming it. When the same site was revisited in August 1985, the cashel itself had been levelled, and neither the enclosure wall nor the hollow remained visible. Whatever the ground had been holding onto, it was no longer giving any sign of it.

What makes Drumharsna worth pausing over is not the absence of a monument but the speed of that absence. In fewer than three years, a cashel substantial enough to have been recorded and revisited was reduced to an unremarkable surface. The souterrain, if it ever existed, went with it. McCaffrey's 1952 reference now sits as the sole documentary trace of a feature that the landscape itself has entirely stopped acknowledging.