This one earns it by having disappeared almost entirely. On a south-west-facing slope at Knockroe in North Tipperary, where the land rolls gently upward in pasture, there is nothing to see. A silage pit and a cluster of farm sheds now occupy the ground where a substantial ringfort once stood, and the site is, as the record bluntly puts it, not visible at ground level.

A ringfort, sometimes called a rath, was a roughly circular enclosure defined by one or more earthen banks and ditches, used as a farmstead and place of shelter during the early medieval period in Ireland, broadly from around the fifth to the twelfth centuries. Thousands survive across the country in various states of preservation. The Knockroe example appears to have been bivallate, meaning it had two concentric banks rather than the single ring more commonly seen, which would have made it a relatively significant site. It showed up clearly on the Ordnance Survey six-inch map edition of 1952 to 1953 as a large, roughly circular enclosure, evidence that it was still legible in the landscape within living memory. The farm sheds that replaced it were built approximately a decade before the site was documented, suggesting the loss occurred sometime in the late twentieth century.