Somewhere in the grounds of Davidstown Demesne in County Kildare, two circular enclosures sit so close together they are almost one, their outlines visible not as earthworks you can walk around and touch, but as ghostly cropmarks printed onto the landscape from the air. Cropmarks form when buried features such as ditches or banks influence how grass or crops grow above them, producing colour or height differences that are invisible at ground level but legible from altitude. An aerial photograph, catalogued as CUCAP ASU 54, captures these two rings laid nearly on top of each other, each estimated at roughly 35 metres across, pressed into a fairly steep south-facing slope.

When the site was documented on the ground in 1955 by Danaher, it was recorded as a ringfort with two banks and a broad fosse, the fosse being the ditch that typically encircled a rath, the common Irish term for a ringfort. Ringforts were enclosed farmsteads used broadly throughout the early medieval period, and Ireland contains thousands of them, yet this example carries a particular oddity. The aerial evidence suggests two enclosures of similar size sitting almost directly superimposed, which raises the question of whether this was a bivallate ringfort built with two concentric rings of defence, or two separate structures constructed at different times that happened to occupy nearly the same ground. The 1955 description of two banks supports the former reading, though the aerial cropmark geometry leaves the matter intriguingly open. The site also sits approximately 30 metres east of a separate enclosure recorded nearby, suggesting this part of the demesne was used and reused over a considerable stretch of time.