This one, a ring-barrow in the townland of Ballyphilip in County Limerick, does the opposite. It sits in low-lying, wet pasture crossed by land drains and watercourses, and it is effectively invisible at ground level. No trace of it appears on Ordnance Survey Ireland historic maps, and aerial ortho-imagery taken between 2005 and 2012, as well as a Google Earth image from March 2017, shows nothing to indicate its presence. The only reason we know it exists at all is because, from the air and under the right conditions, the crop above it gives the game away.

A ring-barrow is a burial mound, typically from the Bronze Age, defined by a circular bank and ditch. In this case the monument takes a penannular form, meaning the ring is almost but not quite closed, leaving a gap, as though the circle has been interrupted. Its existence was established by the Bruff aerial photographic survey in 1986, when it appeared as a cropmark, the faint but legible stain that buried features leave in vegetation when dry conditions cause the soil above a ditch or bank to behave differently from the surrounding ground. The survey image, catalogued as Bruff 15702 (AP 4/3665), captured it at that moment of visibility. The barrow does not stand alone; it sits within a larger complex of ring-barrows, and abuts a neighbouring example immediately to the south-east, suggesting this corner of Limerick was once a significant funerary landscape, a place where communities returned repeatedly to bury their dead.

Visiting presents an obvious difficulty. There is nothing to see on the ground, and the pasture here is wet and drained by watercourses, making access uneven at the best of times. The monument occupies private farmland, so any visit would require the landowner's permission. The experience is less about standing before something ancient and more about understanding how much of the Irish landscape conceals archaeology that only reveals itself from altitude, in a dry summer, to a camera pointed downward. The aerial survey images catalogued under the Bruff survey remain the clearest record of this site, and those with an interest in how such landscapes are read and recorded may find the methodology as compelling as the monument itself.