The 1910 edition of the Ordnance Survey six-inch map records a sweathouse roughly 75 metres south-west of a long-vanished house, beside a small stream that runs south-west to north-east across a north-east-facing slope. Visit today and you will find no visible trace at ground level, which is itself a quietly telling detail. A place of therapeutic ritual, reduced entirely to a cartographic memory.

Sweathouses were a distinctly Irish form of heat therapy, used from at least the early medieval period through to the nineteenth century. Typically built from stone and turf, they were low, beehive-shaped or rectangular chambers, sometimes barely large enough to admit a single person crouching. A fire would be lit inside, the embers raked out once sufficient heat had built up, and the user would then enter and sweat in the enclosed warmth, often emerging to plunge into a nearby stream or pool. That stream beside the Lacoon site is not incidental; it was almost certainly part of the practice. Sweathouses tend to cluster in the north midlands and Ulster, and Leitrim has a notable concentration of them, suggesting they were woven into the fabric of everyday rural life in ways that formal medicine never reached. The Lacoon example, recorded by Michael J. Moore in the Archaeological Inventory of County Leitrim published in 2003, is one of the quieter entries in that record, notable chiefly for its near-total disappearance.