Somewhere in Palmerstown Lower, on the western edge of County Dublin, a house once stood, substantial enough to be recorded by surveyors in the 1650s, yet now so thoroughly lost that its precise location cannot be determined. No ruin, no foundation, no field tradition appears to survive. The structure has not merely fallen; it has, in some practical sense, vanished.

The evidence for it comes from the Down Survey, a remarkable cartographic project carried out between 1655 and 1656 under the direction of William Petty. Commissioned in the aftermath of the Cromwellian conquest of Ireland, the survey was intended to map forfeited lands in enough detail to facilitate their redistribution to soldiers and adventurers who had backed the parliamentary cause. It remains one of the earliest systematic land surveys of Ireland, and its maps, for all their imprecision by modern standards, capture a landscape in transition, recording settlements, churches, castles, and dwellings that were in many cases about to change hands or disappear altogether. The dwelling at Palmerstown Lower appears on one of these maps, placing it firmly within the 16th or 17th century, though nothing more specific about its date, its occupants, or its form is known. The record was compiled by Geraldine Stout and uploaded to the archaeological inventory in August 2011.

For anyone curious enough to go looking, Palmerstown Lower lies within what is now a largely suburban part of west Dublin, absorbed into the city's sprawl over the course of the twentieth century. There is no marker, no interpretive sign, and no visible trace to seek out. The interest here is less in the place as a destination and more in what the absence itself suggests: centuries of agricultural use, later development, and simple time have erased whatever stood here, leaving only that single cartographic dot as evidence that something once existed. The Down Survey maps are freely accessible online through the Trinity College Dublin digital collections, and tracing the original mark on the 17th-century parchment is, in its own way, as close as anyone is likely to get to this particular building.