A ringfort recorded near Riddlestown in County Limerick falls firmly into the second category. Where a roughly circular earthwork once occupied a gentle east-facing slope just below the brow of a low hill, there is now nothing to see at all, the monument having been levelled entirely. Its absence, paradoxically, tells you quite a lot about the pressures Irish farmland has faced over the past century.

Ringforts, known in Irish as raths, were enclosed homestead sites typically dating from the early medieval period, roughly the fifth to the twelfth centuries. They usually consisted of a circular earthen bank and ditch surrounding a domestic area, and they survive in their thousands across Ireland, though many have been lost to agriculture. The Riddlestown example was documented on the Ordnance Survey six-inch map of 1923, which shows it as a roughly circular enclosure approximately thirty metres in diameter. By the time Denis Power compiled his survey notes, uploaded in August 2011, inspection of the site revealed no trace of the monument whatsoever. The southern arc of the original enclosure appears to have been clipped by a farm passage running east to west, and a field boundary that once marked the eastern edge of the site has since been removed. The cumulative effect of these agricultural changes has been the complete erasure of a structure that had already survived well over a thousand years.

For anyone curious enough to visit, the site sits in pasture on what the notes describe as a gentle east-facing slope just below a low hilltop, a position typical of ringfort placement, which often favoured slightly elevated ground offering reasonable drainage and modest views. There is nothing visible on the surface to reward the eye, and the land is privately farmed, so access would require the goodwill of the landowner. The real reason to seek it out is less about what you will see and more about understanding how comprehensively a monument can be absorbed back into the working landscape. The 1923 OS map, available through the Irish historic maps viewer online, remains the clearest evidence that anything was here at all.