On the Curragh, the great open plain of County Kildare long associated with horse racing and military training, a faint ring in the ground marks what was once a human dwelling. It is so subtle that it escaped ground-level notice entirely, coming to light only when an aerial photograph taken by the Department of Defence in 1999 revealed the tell-tale outline from above. What the photograph showed was a small, roughly circular area measuring about 4.3 metres north to south and 3.7 metres east to west, enclosed by an earthen bank so low, just 10 centimetres high, that a person walking past would almost certainly mistake it for a natural undulation in the grass.

This type of feature is generally classed as a hut site, the remains of a simple, low-status enclosure that would once have defined the footprint of a single dwelling or small working space. The bank itself is relatively wide in proportion to its height, between 2.2 and 2.7 metres across, suggesting it has spread and settled considerably over time. There is no obvious entrance gap and no fosse, the term for a ditch that typically accompanies an earthen enclosure, which makes it difficult to date or interpret with any confidence from surface evidence alone. Its position near the eastern foot of a long gentle slope is consistent with the kind of sheltered, well-drained spot that people across many centuries chose when putting up a modest structure on open ground.