At Raheen in County Kilkenny, that is precisely what happened. Vegetation clearance in advance of proposed afforestation exposed a stretch of dry-stone walling running roughly north to south for an estimated 60 metres, its northern end butting up against a modern field boundary and its southern extent lost again beneath a dense tangle of growth that prevented further investigation.

Examined in 2012, the wall showed signs of belonging to a larger, mostly buried field system. A probable cross-wall was visible near the southern end of the exposed section, and a collapsed fragment appeared where an access route had been cut through the vegetation to the east, hinting at a more structured layout beneath. What caught the attention of those examining it was the construction itself: the wall is made up of stones of widely varying sizes, several of them described as megalithic in proportion, a term that here simply means unusually large, in the range associated with prehistoric building traditions. Some are set upright rather than laid flat, though none are firmly anchored in the ground. This technique does not match the character of any of the eighteenth or nineteenth century field walls in the surrounding area. The first edition Ordnance Survey six-inch map, surveyed in 1839, does indicate a field boundary in roughly this location, and also places a trigonometrical station at 447 feet above ordnance datum nearby, but the surveyors who recorded that boundary were likely mapping something that was already ancient. The possibility that the wall system dates to the prehistoric period has been explicitly raised and cannot be ruled out.

Most of the field system almost certainly remains concealed, waiting beneath vegetation that has so far resisted any systematic investigation. What is visible is fragmentary, its full extent and date unresolved, a quiet puzzle sitting beneath the surface of a Kilkenny hillside.