Beside a rath near Churchground in County Kerry, a compact oval structure was noted during a survey in the 1940s as a curious feature of the fort, described as if it were a dwelling attached to the earthwork's south-eastern side. It measured roughly 2.74 metres high, with a base of about 1.83 metres and walls around 0.61 metres thick, built from limestone rocks and mortar, and sitting at a slightly lower level than the surrounding rath.

A rath is a roughly circular earthen enclosure, typically associated with early medieval settlement in Ireland, and it would not be unusual to find ancillary structures nearby. What is unusual here is the paper trail. The 1940s description was taken at face value and the site was classified as a house for decades, appearing under that label in official monument records as late as 1997. It was only when the 1841 to 1842 Ordnance Survey six-inch map was consulted that a different picture emerged. On that map, a limekiln is clearly depicted abutting the north-eastern side of the rath. A lime kiln is an industrial structure used to burn limestone at high temperatures to produce quicklime, used historically in mortar, whitewash, and agricultural soil treatment. The oval form, the limestone construction, the thick walls built to contain heat, all of it fits a kiln far better than a house. No visible remains survive above ground today, which makes the cartographic evidence the clearest guide to what once stood there.