The rath at Crotta in north County Kerry does none of that. Nothing is visible above ground today, and the circular enclosure, the kind of defended farmstead that thousands of early medieval Irish families would have called home, has left no surface trace whatsoever on the landscape around it.

What makes this site quietly puzzling is its cartographic history. When the Ordnance Survey mapped this part of Kerry in 1841 and 1842, the enclosure does not appear to have been recorded at all, yet by the time the 1916 edition of the map was produced, it was marked. Whether it had simply been overlooked in the earlier survey, or whether some trace was then still legible in the field that has since disappeared entirely, is unclear. C. Toal's North Kerry Archaeological Survey, published in 1995, adds one further detail worth noting: the area around Crotta appears to have been heavily wooded in the past, though that forest cover is long gone. Dense woodland can both preserve and obscure earthworks, shielding banks from the plough while making them difficult to spot or record. In this case, the trees have gone and the monument has gone with them, or at least any outward sign of it has.