This one earns it by disappearing. On a steep slope facing north-north-west in the rough pasture of Dooncaha, County Limerick, there once stood a rath, a type of circular earthen enclosure used as a farmstead and defended residence during early medieval Ireland. Today, according to the survey record, there is nothing left to see at all.

The monument was recorded on the Ordnance Survey six-inch map of 1841, depicted as an embanked circular enclosure with a diameter of approximately thirty metres. A rath of that size would have been a modest but meaningful presence in the landscape, its raised earthen bank marking out a domestic and agricultural world that likely dated back over a thousand years. When Denis Power compiled the site record and the inspection was carried out, the findings were stark: the monument had been levelled, and no trace of it remained. The 1841 map, then, preserves the only reliable image of what was once here, a circle of earth that has since been absorbed entirely into the surrounding farmland.

For anyone curious enough to visit Dooncaha, the experience is less about what can be seen and more about what the absence itself suggests. The steep north-north-west-facing slope is not the easiest terrain, and the rough pasture offers no obvious landmark or feature to orientate yourself by. The 1841 OS six-inch map, available to browse through the OSi historical map viewer online, is the closest thing to a guide, showing the enclosure in its original position. It is worth cross-referencing with the current landscape to get a sense of what agricultural improvement or land clearance has quietly undone over the intervening century and a half. There is a particular quality to a site where the historical record and the ground simply fail to agree.