Not because access is restricted, or because it has been built over, but because there is simply nothing left above the surface to look at. The barrow at Tankardstown exists, as far as current evidence goes, only as a ghost in a photograph taken from the air on a November day in 1984, showing up as a faint circular cropmark in a rough wet pasture before disappearing entirely from the visual record.

A barrow is a burial mound, typically of prehistoric origin, sometimes surrounded by a ditch from which earth was originally quarried to raise the central mound. This particular example was never recorded on Ordnance Survey historic maps, and it came to light only as a result of aerial survey work carried out in connection with the Bórd Gáis Éireann Curraleigh West-Limerick gas pipeline. The photograph, catalogued as Site No. 040256 at a scale of 1:50,000, was taken on 3 November 1984, and it caught what analysts interpreted as the outline of a small circular feature consistent with a ditch barrow. Cropmarks of this kind appear when buried ditches or earthworks affect the moisture retention of the soil above them, causing overlying vegetation to grow at a slightly different rate, a difference sometimes visible only from altitude and only under the right conditions of drought or season. By the time orthophotography became available between 2005 and 2012, and in subsequent Google Earth imagery, no trace remained visible. The site sits approximately 85 metres west of the townland boundary with Ballybeg and lies to the west of a broader cluster of recorded barrows and an enclosure, suggesting this was once a more extensive mortuary or ritual landscape. The record was compiled by Fiona Rooney and uploaded to the Sites and Monuments Record in May 2021.

For anyone curious enough to visit the general area, the surrounding cluster of barrows in Tankardstown offers more tangible remains, though even those sit in rough agricultural ground and require some patience to locate. The site of the cropmark barrow itself has no surface expression, so what draws people here is less the monument than the idea of it: a burial place that survived millennia underground only to announce itself briefly in a single aerial frame before falling silent again.