Near the airstrip are the sunken remains of a church; the spot is said to have been the site of St Enda's Monastery in the 5th century, though what's visible dates from the 8th century onwards.
The ruins of numerous stone churches identify the island's monastic history. This small church, with a high cross in the churchyard, is near Kilronan.
Along the road between Kilronan and Dún Aengus is the smaller, perfectly circular fort, Dún Eochla, which makes for a good walk from the main road.
This ancient fort (the Black Fort) is dramatically perched on a clifftop promontory southwest of Kilronan.
To the southeast, near Cill Éinne Bay, is this early-Christian church.
To the south of the Na Seacht dTeampaill ruins is this circular fort.