Man-made underground passage in Annaghkilly

Annaghkilly holds a rock-cut circular depression eight metres across at the north end of a drumlin ridge, joined to a seven-metre western trench. The official label calls it an underground passage, yet no entrance, roof or hidden chamber is recorded. That gap between name and shape gives the place its life. A chamber may have collapsed, a tunnel may have been filled, or a quarry may have worn the edge of an older route. Stand at the circular hole and look west along the trench. The ridge, rath and cut stone still point to human direction even when the passage itself has disappeared.