The cashel at Boolavoord, in County Limerick, is one such place. A cashel is simply a ringfort built from stone rather than earthen banks, and this example presents itself as little more than a slumped circular wall on a gentle rise, the original structure having collapsed to the point where even its entrance can no longer be identified on the ground.

When the archaeologist O'Kelly surveyed the site in the early 1940s, the description recorded was not especially encouraging. The bank was already very much collapsed, no fosse (the ditch that typically surrounds such enclosures) was visible, and dense overgrowth had made a proper examination difficult. What could be measured was an overall diameter of approximately 105 feet, or 32 metres, which is a fairly typical scale for a rural ringfort. These structures date broadly to the early medieval period in Ireland, roughly the fifth to the twelfth centuries, and served as enclosed farmsteads for a single family or small community. The stone construction, rather than the more common raised earthen bank, suggests the builders had ready access to local stone and preferred it as a building material. O'Kelly's notes were compiled as part of what became a broader archaeological record, later drawn together by Caimin O'Brien, whose compiled entry was uploaded in February 2020.

For anyone inclined to seek the site out, it is worth knowing that its outline is visible on Digital Globe aerial photographs, which means satellite mapping tools can help with orientation before arrival. On the ground, however, expectations should be kept modest. The monument sits on rising ground, which may give some sense of the strategic logic behind its original placement, but the walls themselves have long since merged with the surrounding landscape. What you are looking for is the faint arc of collapsed stonework beneath whatever scrub and growth has taken hold since the 1940s survey, when the site was already considered too overgrown to read clearly. Some sites reward the visit precisely because they demand that kind of patience.