Others survive only as faint marks visible from the air, betraying their existence not through any surface feature a walker might notice, but through the differential growth of grass or crops above buried ground. At Knockaunroe in County Limerick, that is precisely the situation. What appears here is not something you can easily walk up to and identify on the ground; it is a ghostly impression of the past, legible only when viewed from above.

The site was recorded by Denis Power, whose notes, uploaded in September 2013, identified the cropmarks of at least two possible ring barrows at this location through examination of aerial photographs on Google Earth. Ring barrows are circular funerary monuments, typically consisting of a low central mound surrounded by a ditch and sometimes an outer bank, dating broadly to the Bronze Age in Ireland, though some were constructed or reused into the early medieval period. They were burial places, memorials, or territorial markers, and thousands once existed across the island. Many have been ploughed flat over centuries of agriculture, leaving no visible trace at ground level. What aerial photography reveals is the buried outline of the ditch and bank, where soil conditions differ subtly from the surrounding field, causing overlying vegetation to grow at slightly different rates or colours, particularly in dry summer conditions. At Knockaunroe, at least two such circular outlines were detectable in this way, suggesting a cluster of monuments rather than an isolated example.

Because the site is known primarily through aerial observation rather than ground survey or excavation, there is little to see in person during an ordinary visit. The land at Knockaunroe is agricultural, and the cropmarks that define the barrows would only be visible from altitude and under particular conditions, most likely during dry spells in late spring or summer when moisture stress brings out the contrast between disturbed and undisturbed ground. Anyone with a serious interest might compare the Google Earth imagery with the relevant Ordnance Survey sheets to locate the approximate field. The value here is less in the visit itself and more in what the site represents, namely the degree to which the Irish landscape continues to conceal monuments that formal survey has yet to fully document at ground level.