At Levitstown in County Kildare, there is a monument that most people walking or driving past would never suspect is there. No mound rises above the surface, no stone marks the spot; what exists is essentially invisible to anyone standing on the ground. The only way it has ever been seen clearly is from the air, where the buried remains of a circular ditch betray themselves through a cropmark, a phenomenon in which buried features affect the growth of crops above them, producing subtle variations in colour and height that become legible when viewed from altitude.

Aerial photographs taken as part of the Cambridge University Collection of Aerial Photography recorded a cropmark of a fosse, meaning a ditch, tracing out a small circular enclosure with an estimated maximum diameter of around fifteen metres. The shape and scale suggest a ring-barrow or ring-ditch, both of which are prehistoric funerary monument types typically associated with the Bronze Age. A ring-barrow generally consists of a low central mound enclosed by a ditch and sometimes an outer bank, while a ring-ditch may represent the eroded remains of such a mound, where the earthwork itself has long since been ploughed flat, leaving only the ditch circuit below ground. At fifteen metres across, this is a modest example, but modest size was not unusual for such monuments, which were built to mark individual or small-group burials rather than to dominate a landscape.