A circular enclosure near Kilcooly Abbey in County Tipperary is one such place: no earthwork rises above the soil, no stones mark its edge, and a visitor standing directly over it would have no idea anything was there. What exists instead is a cropmark, a ghostly outline first caught on an aerial photograph taken in July 1966 as part of the Cambridge University Collection of Aerial Photography. Ploughing has thoroughly disturbed the surface over the years, erasing whatever slight traces may once have lingered at ground level.

Circular enclosures of this kind were common features of the early Irish landscape, typically serving as enclosed farmsteads, ritual sites, or boundary markers during the early medieval period, though their dates and functions vary widely. This particular example sits on level ground in an arable field, roughly 200 metres to the south-southeast of Kilcooly Abbey, a Cistercian house founded in the twelfth century. Intriguingly, a 1749 map of the estate, cited by Neely, makes no mention of the enclosure at all, suggesting it had already been so thoroughly absorbed into the farmed landscape by that point as to leave no impression on those surveying the land. What is also notable is that this site is far from alone: at least four other enclosures have been recorded within a few hundred metres, hinting that this corner of Tipperary was once a much more densely organised and inhabited place than its current agricultural appearance suggests. Despite being invisible at surface level, the site carries a preservation order under the National Monuments Acts, recognising that the archaeological deposits below the disturbed soil may still hold information about the people who built and used it.