It has, in fact, been there since prehistoric times. This is a ring-barrow, a type of funerary monument typically associated with the Bronze Age, in which a central burial mound is encircled by a ditch, or fosse, and then an outer earthen bank. What makes the Doonnagore example quietly compelling is how intact the whole arrangement remains: the concentric geometry of mound, fosse, and bank is still clearly legible from ground level, and the slight central depression on top of the mound hints at whatever lies, undisturbed, beneath.

The monument measures roughly 23 metres across in both directions, making it a substantial structure. The central mound rises between 1.3 and 1.55 metres above the flat-bottomed fosse that encircles it, and the outer bank, between 4.2 and 4.6 metres wide, retains much of its original profile. A short section of the bank on the eastern side is notably flat-topped, while the rest rounds off more gently; stones are visible in the bank's make-up, suggesting deliberate construction rather than simple earth-piling. A narrow gap in the bank at the north-north-east, about a metre wide, was opened at some point for livestock, and a later field boundary was built directly against the outer face of the bank to the north, though this has been almost entirely levelled. The monument was already being recorded cartographically by the late nineteenth century, appearing on the Ordnance Survey twenty-five-inch plan of 1897 and again on the Cassini edition of the six-inch map from 1920. It does not stand alone: two further ring-barrows occupy ground within a hundred metres to the south and south-south-west, suggesting that this stretch of coastal pasture was once a deliberate place of burial, chosen and returned to by people who understood this landscape very differently from those who later ran their cattle across it.