That, in a way, is precisely the point. Beneath reclaimed pasture in County Limerick lies what archaeologists believe to be a ditch barrow, a type of prehistoric burial monument defined by a circular enclosing ditch, often with a low internal mound. It left no trace visible to walkers, appeared on no Ordnance Survey historic map, and might have remained entirely unrecorded had a plane not passed overhead at the right moment.

The site came to light during the Bruff aerial photographic survey of 1986, when a small circular cropmark, the kind of faint patterning in vegetation that betrays buried features to a trained eye, was picked up and catalogued as a possible barrow. Cropmarks form when buried ditches or walls affect how plants grow above them, producing subtle differences in colour or height that become legible from altitude even when invisible at ground level. The Rathanny example sits roughly 140 metres east of a larger and more conspicuous barrow, and is considered part of a wider cluster of up to eleven possible barrows in the area, suggesting this corner of Limerick may once have held some significance as a funerary or ceremonial landscape. Orthophotographs taken between 2005 and 2012 showed no surface remains whatsoever, but a Digital Globe orthoimage captured between 2011 and 2013 produced a faint cropmark consistent with a ditch barrow, lending the identification a little more weight without confirming it outright. The record was compiled by Fiona Rooney and uploaded to the national monuments database in May 2021.

For anyone curious enough to seek it out, the site is in ordinary agricultural land and offers nothing in the way of visible archaeology. Its interest lies elsewhere, in what it represents about how much of Ireland's prehistoric past remains invisible to ordinary observation and recoverable only through aerial survey, remote sensing, and careful archival work. The larger barrow 140 metres to the west is the more tangible presence, and reading the two together, one confirmed by surface remains and one discernible only as a whisper in a satellite image, gives a reasonable sense of how these monuments are identified and debated before any spade enters the ground.