The possible rath at Coolcorcoran, Co. Kerry, offers nothing of the sort. Standing in the level pasture east of the local cemetery, a visitor would see only grass, with no earthwork, no bank, no visible boundary of any kind. The site exists, in a very real sense, only from the air.

What gave it away was a cropmark, the kind of ghost impression that appears in aerial photographs when buried features affect how vegetation grows above them. A circular enclosure roughly twenty metres in diameter showed up in a photograph taken in 1971, along with what may be a fosse, a defensive ditch, curving around the north-east. A rath, to use the Irish term for this class of monument, was typically a farmstead of the early medieval period, enclosed by one or more earthen banks and their accompanying ditches, and used to protect a family's home and livestock. Thousands survive across Ireland in various states of preservation. This one has been almost entirely absorbed into the landscape, leaving only that faint chemical signature in the soil, readable only when crops or pasture respond differently over the filled-in ditch than over undisturbed ground around it.

There is nothing to see at ground level, which is, in its own way, the point. The site serves as a reminder that the Irish countryside holds far more archaeology than is visible to the eye on any given walk, and that some of the most informative evidence for early settlement patterns has only ever been legible from above.