In a field somewhere in the Kildare townland of Beaconstown, there is a mound that no longer exists, at least not in any form the eye can detect. What makes this particular absence curious is that it was once considered worth recording, a small circular earthwork that somebody thought significant enough to mark on a map more than two centuries ago, and which has since vanished entirely from the surface of the landscape.

The sole surviving evidence for this earthwork comes from a county map produced in 1783 by the cartographer Taylor, who surveyed Kildare in considerable detail. On that map, the feature is rendered as a small circular form, the kind of notation typically used for a low earthen mound, possibly a burial monument, a territorial marker, or a ringfort remnant. Circular earthworks of this general type are scattered across Ireland in their thousands, many of them prehistoric in origin, others dating to the early medieval period. Whatever this one was, it had either already been substantially reduced by the time Taylor surveyed it, or it was levelled in the centuries that followed, through agricultural clearance, ploughing, or simply the slow flattening effect of time and use. No visible surface trace remains today.