At Caherhenryhoe in County Galway, a north-east-facing hillslope holds the ghost of a structure noted on the 1838 edition of the Ordnance Survey six-inch map as a very small rectangular feature, labelled simply "Stone" in Roman script. Whatever once stood there has since vanished entirely, leaving no visible surface trace.

The 1838 OS six-inch maps were among the most ambitious cartographic projects of their era in Ireland, capturing not only roads and townland boundaries but also antiquities and local features that surveyors deemed worth recording. That the cartographers paused to mark this particular spot, and gave it the plain designation "Stone", suggests it was conspicuous enough at the time to warrant attention. The current working interpretation is that it may have been a standing stone, the kind of upright megalith erected across Ireland during prehistory for purposes that remain debated, ranging from burial markers to territorial boundaries to astronomical alignments. What ended its existence is not recorded, but the answer may lie nearby: the land to the south-east, south, and west of the site has been extensively quarried, and it is not difficult to imagine that whatever once stood here was consumed by that same process, broken up or simply removed.