Somewhere on the lower slopes of Lyons Hill in County Kildare, a small concrete box sits embedded in the top of an ancient earthen bank. The box is a meteorological station, roughly a metre square, and its presence is either an indignity or an accidental curiosity depending on your disposition. It occupies the eastern sector of a subcircular enclosure whose origins are almost certainly prehistoric, and its installation at some point in the relatively recent past is a neat illustration of how landscapes accumulate uses without quite noticing what they are disturbing.

The enclosure itself was not identified on the ground but from the air, spotted in an aerial photograph. That is not unusual for sites of this kind: a ringfort or similar enclosed settlement, reduced over centuries of ploughing, grazing, and general neglect, can become nearly invisible at eye level while remaining legible from above as a crop or soil mark. This particular example sits on a gentle slope facing north-northeast, near the northern foot of Lyons Hill, which rises to around 651 feet above sea level. The surrounding land was once part of demesne grounds, the managed estate landscape attached to a country house. What remains of the enclosure is a broad, low earthen bank, between 5.6 and 7.7 metres wide, enclosing an interior roughly 34 metres across at its widest. The bank stands no more than 1.5 metres above the surrounding ground on the exterior, and in places it has been reduced to little more than a scarp. The interior is effectively flat relative to its surroundings, with a height difference of only about 0.2 metres.

There is not much left to see, which is part of what makes the site interesting as a category rather than a spectacle. The enclosure survives poorly, the meteorological station intrudes on what remains of the bank, and the former demesne setting gives the whole area a layered quality, with centuries of different land uses folded quietly into a pasture slope that gives very little away.