This one is remarkable for what is no longer there. At Knockshanawee in County Cork, a standing stone that was once substantial enough to be plotted on Ordnance Survey maps has since vanished entirely, leaving no visible trace on the ground. Standing stones are among the most common prehistoric monuments in Ireland, typically single upright stones set into the earth, their original purposes debated but variously associated with burial, boundary-marking, or ritual. That one could simply disappear, even a stone nearly three feet tall, is a reminder of how precarious the survival of such monuments has always been.

The stone appeared on both the 1842 and 1903 editions of the Ordnance Survey six-inch maps, meaning it was a recognised feature of the landscape for at least the better part of a century. When P. J. Hartnett visited and recorded it in 1939, he described an irregular sandstone boulder standing thirty-six inches high. The word irregular is telling; this was not a finely dressed or particularly imposing monument, but a rough lump of local stone set upright in a field, the kind of thing that might attract curious glances from passing farmers without ever drawing the wider attention that might have protected it. At some point after Hartnett's visit, it was removed, and the site now offers nothing to see at surface level.