In a field near Barberstown in County Kildare, nine prehistoric burial monuments sit so completely beneath the surface that they are invisible at ground level. No earthworks, no visible mounds, nothing to catch the eye of a passing walker. The only way to see them at all is from the air, and even then only under the right conditions, when a dry summer causes the soil above the ancient ditches to betray itself in the colour and growth rate of the crops above.

These are ditch-barrows, a form of funerary monument in which the central burial area was defined by a surrounding circular ditch cut into the earth rather than a mounded bank raised above it. Over centuries of cultivation and weathering, the upcast material from such ditches disperses and the surface flattens, leaving the buried cut features as the only surviving trace. What remains at Barberstown is a barrow cemetery, a cluster of nine such monuments sharing the same field, one of which appears as a roughly circular cropmark approximately five metres in diameter when viewed on aerial imagery. The group was identified from Google Earth photography taken in June 2018, when seasonal drought conditions made the cropmarks legible, the buried ditches retaining moisture and producing slightly lusher growth that registers as faint rings in aerial photographs.