At Oldcourt in County Cork, a ringfort once sat on a north-facing slope in what is now pastureland. A ringfort, or rath, is a roughly circular enclosure defined by one or more earthen banks and ditches, typically built during the early medieval period as a farmstead or place of habitation. This one measured approximately forty metres in diameter, a modest but respectable size. Today, there is nothing to see.

The fort's existence is known almost entirely from cartographic evidence. The Ordnance Survey's six-inch map of 1842 recorded it as a hachured circular enclosure, the conventional symbol surveyors used to indicate an earthwork with raised banks, sitting immediately south of an east-west road. By the time the same area was mapped again in 1936, the distinctive earthwork symbol had disappeared, replaced only by the outline of a circular field. The shape of the land had been retained, absorbed into the agricultural geometry of the farm, but the physical structure had been levelled. Sometime between those two surveys, the banks were removed, most likely cleared to improve the grazing or ease the working of the land. The circular field boundary was itself presumably lost thereafter, leaving nothing visible at the surface today.