That is precisely the situation at Dooally in County Limerick, where a ringfort once stood in level pasture and now, by all accounts, does not stand at all. The site is listed, catalogued, and mapped, yet the thing it describes has been erased from the ground entirely.

A rath, to use the Irish term, is a type of early medieval enclosure, typically circular and defined by one or more earthen banks and ditches, which served as a farmstead or the residence of a local landowning family. Thousands survive across Ireland in varying states of preservation. The one at Dooally appeared on Ordnance Survey six-inch maps produced in 1924, recorded there as an embanked roughly circular enclosure with a diameter of approximately thirty metres, which is a fairly typical size for such a monument. At some point between that cartographic record and the site inspection compiled by Denis Power in 2011, the feature was levelled. When Power examined the ground, no trace of the monument was evident. What had been a low but legible earthwork in level pasture had been smoothed away, most likely by agricultural activity.

The site sits in ordinary farmland, and there is no visitor infrastructure of any kind, which is unsurprising given that there is nothing left to visit. Its interest now is almost entirely archival: it is a case study in how quickly the physical record of early medieval settlement can disappear, and how the gap between a map and the present-day landscape can widen without anyone formally marking the moment of loss. If you find yourself in the area and are curious enough to locate the general townland of Dooally, what you will encounter is a level field in Limerick pasture, ordinary in every visible respect, with only its place in a national monuments database to suggest that something once occupied the ground beneath it.