It left behind no hearth, no floor deposits, no discarded objects, no sign of the everyday activity that usually clings to a place where people lived or worked. What it did leave was a precise arc of post-holes, the ghost of a ring of upright timbers that once formed a building roughly 7.4 metres across.

The structure came to light in 2002, during excavations carried out ahead of the bypass construction in the townland of Ballinaspig More in County Cork. Eleven post-holes were identified, each roughly 0.4 metres in diameter and spaced with a regularity of between 1.4 and 1.6 metres, suggesting deliberate, planned construction rather than something thrown together in a hurry. The arc is incomplete; post-holes that would have closed the circle to the north-northeast are absent, though erosion over the intervening centuries is the most likely explanation for the gap rather than any original irregularity in the design. Charcoal recovered from the fill of one of the post-holes was radiocarbon dated to between 360 and 280 BC, placing the structure in the Later Iron Age. The excavation was published by Danaher and Cagney, and the site is documented in the Archaeological Inventory of County Cork.

What the building was actually for is the genuinely puzzling part. The complete absence of internal features, any trace of a fire, or accumulated occupation debris means it cannot easily be classified as a house, a byre, or a storage building in any conventional sense. A ritual or ceremonial function is possible, though that category risks becoming a catch-all for anything the evidence refuses to explain. It is, in the end, a ring of holes in the ground, precisely arranged, carefully dated, and stubbornly silent about its purpose.