The site at Ardnaglass is one such place, catalogued in Seán Ó Nualláin's authoritative survey of the county's megalithic tombs but seldom drawing the visitors who make for better-known monuments nearby.

Ó Nualláin's 1989 volume, the fifth in his county-by-county survey of megalithic tombs across Ireland, brought together decades of fieldwork documenting the court tombs, portal tombs, passage tombs, and wedge tombs that survive in varying states across the country. Megalithic tombs, broadly speaking, are prehistoric burial monuments built from large stones, typically dating to the Neolithic period, roughly 4000 to 2500 BC, when farming communities were establishing themselves across Ireland. Sligo's particular abundance of such sites, from the great passage tomb cemetery on Carrowmore to the monument at Knocknarea, reflects both the density of Neolithic settlement in the region and the preservation conditions of its upland and coastal terrain. Ardnaglass falls within this same county-wide pattern, recorded by Ó Nualláin as part of his systematic effort to document what remained before further deterioration or loss could occur.