That uncertainty is itself the most striking thing about the site at Corleanamaddy: the structure was recorded, measured, and documented, and then, at some point after 1984, it may have been removed entirely. What survives, if anything does, is a question that has not been conclusively answered.

When the surveyor H. G. Tempest visited in 1936, he found a substantial cairn, a mound of stones used to cover and mark a megalithic tomb, running roughly north-north-east to south-south-west and measuring some 28 metres long by 12 metres wide. At its northern end sat a portal tomb, the type of megalithic monument characterised by two tall upright stones forming a doorway-like entrance, typically capped by a large roof stone and dating to the Neolithic period, broadly four to six thousand years ago. The tomb chamber itself was modest, around 2 metres long and just over a metre wide, formed by a pair of portal stones, two side stones, a back stone, and a roof stone that had already shifted from its original position by the time Tempest recorded it. More unusually, the cairn also contained the remains of two subsidiary chambers opening off the eastern side, suggesting a more complex monument than a simple portal tomb alone.

The location adds a quiet strangeness to what little remains known. The site sits about 100 metres south of a small col, the low saddle of ground between two gentle rises to the east and west, on ground that slopes away to the south-west. Whether the monument still stands in any form is genuinely unclear.