Killarga is an ancient place of pilgrimage and was attached to a religious settlement, Cill Fhearga, which according to the Annals of the Four Masters was founded by a holy woman, St Fearga, as early as the 6th century.[2] There is a holy well named Tobar Mhuire, a 19th-century lime kiln on the way into it, a Teach Allais (ancient Irish sweat house) and other historical ruins in the area. Nearby is O'Donnell's Rock which is named after Aodh Rua Ó Dónaill.[citation needed]
The village has a school (Saint Brigid's National School), a post office, a community hall, a shop and a pub.[citation needed]
