No hollow sound underfoot, no depression in the grass, no visible stone lintel poking through the soil. The place is, in the most literal sense, invisible.

What local memory preserves here is almost certainly a souterrain, a type of man-made underground passage or chamber constructed during the early medieval period in Ireland, typically built from stone and used for storage, refuge, or both. They were often associated with ringforts and farming settlements, and hundreds have been recorded across the country, some intact, some partially collapsed, many known only through tradition or accidental discovery. The Munnane example falls into that last and most uncertain category. No excavation appears to have confirmed the structure, and no physical evidence has been documented above ground. What survives is the word of the locality: there are chambers down there, or there were.