In a field near Skidoo in north County Dublin, an ancient circular monument lies completely invisible to anyone standing on the ground. No earthwork, no stones, no raised bank, nothing to suggest that anything here is out of the ordinary. The site only reveals itself from the air, and even then only under the right conditions, when a dry summer causes buried ditches to affect the growth of crops above them, producing faint but legible patterns in the vegetation.

The ring-ditch first came to light in May 1991, recorded as a positive cropmark on aerial photograph GB91.DM.26. What the photograph captured was a ring-ditch defined by two concentric fosses, that is, circular ditches cut into the ground, presumably in prehistory, and long since silted up and ploughed flat. The inner fosse retains traces of an entrance causeway oriented to the south-west, where the ditch was left uncut to allow passage. Faint evidence of a third outer fosse is also visible. Ring-ditches of this kind are generally understood to be the ploughed-down remnants of burial monuments, the ditches that once surrounded a central mound, though without excavation the precise nature and date of this example remain unknown. The site sits on a low east-west ridge to the north of the Broadmeadow river and forms one of a pair, with a second ring-ditch recorded in close proximity. The western edge of the monument borders the field boundary of Warblestown House, the property of Gillian Barrett at the time of recording. The record was compiled by Geraldine Stout and updated by Christine Baker.

Because there are no visible surface remains whatsoever, a visit to this site is really an exercise in reading a landscape rather than inspecting a monument. The low ridge north of the Broadmeadow offers a sense of the topographic logic that seems to have attracted prehistoric communities to this spot, elevated just enough to command a modest view across the surrounding fields. The cropmarks themselves are only visible from height and only under drought conditions, so the aerial photograph remains the primary way of appreciating what is actually here. Anyone with a serious interest in the site would do better to consult the photographic record than to search the field boundary near Warblestown House for something that, on the ground, simply does not exist.