This one in Kilfrush, County Limerick, offers nothing so generous. What exists here, or what is believed to exist, is known only because a camera mounted in an aircraft caught it from the air in 1986, a faint circular cropmark pressed into the ground below, invisible to anyone standing beside it. By the time satellite imagery was trained on the same patch of wet rough pasture, between 2011 and 2013, even that ghost had gone quiet. No surface remains were visible. The site exists, essentially, as a photograph of a shadow.

The cropmark was identified during the Bruff aerial photographic survey in 1986, recorded as Bruff 97.02 (AP 5/2101). Cropmarks form when buried features, walls, ditches, or filled pits, affect the moisture and nutrients available to the vegetation above them, causing the grass or crops to grow differently enough to show up from altitude, particularly during dry spells when the contrast is sharpest. The circular shape recorded here is consistent with an earthwork, though its precise nature remains uncertain. Adding to the intrigue, a possible barrow lies roughly 45 metres to the northwest, catalogued separately as LI040-201001-. A barrow is a burial mound, typically prehistoric, and their presence in clusters is not unusual across the Irish landscape. Whether the two features are related in date or function is unknown.

Visitors drawn to the genuinely obscure will find this a test of patience and expectation. The site sits in wet rough pasture, so appropriate footwear matters, and access to the land would need to be arranged respectfully with any landowner. There is nothing to see on the ground, no marker, no earthen rise, no obvious break in the vegetation. The interest here is conceptual as much as physical: a place that archaeology acknowledges but cannot yet fully read, documented by Fiona Rooney and uploaded to the record in June 2021. The most useful thing a visitor can bring is a copy of the aerial survey image, if only to stand in wet Limerick grass and appreciate how much of the past refuses to surface.