In the year 2000, monitoring of topsoil-stripping works uncovered the compact remains of a fulacht fia, one of Ireland's most widespread yet least celebrated prehistoric monument types. A fulacht fia, sometimes spelled fulacht fiadh, is broadly understood to be a Bronze Age cooking site, consisting of a water-filled trough into which heated stones were dropped to bring the water to a boil. The stones, repeatedly cracked by thermal shock, were discarded into a characteristic mound nearby. They are found in their thousands across Ireland, often in low-lying or damp ground, and yet each individual example carries its own quiet particulars.

The Nangor site, documented by Doyle in 2001 and compiled by Geraldine Stout, was modest in scale but coherent in its layout. At its centre was a subcircular pit or trough cut into the natural subsoil, measuring 0.56 metres by 1.25 metres, which would have held water during use. Spreading out from this was a scatter of heat-cracked stone covering an area of roughly 1.92 metres north to south and 1.18 metres east to west, though only a shallow deposit of around five centimetres deep. Some six metres further to the west, excavators found a linear gully cut into the boulder clay, measuring 2.57 metres in length and between 0.28 and 0.54 metres wide, with sharply sloping sides and a flat base. Its fill of mid-brown clay contained oxidised clay, flecks of charcoal, and occasional fragments of burnt bone. Whether that bone reflects food preparation, ritual activity, or something else entirely is not recorded, but its presence adds a small note of complexity to what might otherwise read as a straightforward functional site.

The Nangor fulacht fia is not a visitor site in any conventional sense. It came to light during development works rather than dedicated archaeological investigation, and there is nothing on the surface today to mark its location. Its interest lies less in what can be seen and more in what its discovery represents: the routine revelation, during ground disturbance across Ireland, of prehistoric activity that would otherwise remain entirely invisible. For those interested in the archaeology of everyday Bronze Age life, the published record by Doyle remains the primary point of access, and the broader landscape of south County Dublin repays attention for anyone tracing the density of such sites across the Irish midlands and eastern counties.