Dún Aonghasa

Dún Aonghasa is a prehistoric stone fort on Inishmore (Inis Mór) in the Aran Islands, County Galway, Ireland, noted for its cliff-edge position and dry-stone concentric defenses.

The monument comprises multiple concentric stone ramparts that enclose an inner area directly adjacent to high Atlantic cliffs; the site commands sweeping coastal views and is one of Ireland’s best-known prehistoric forts. The surviving walls and their arrangement are the site’s principal features.

Archaeological evidence places construction and use in the later prehistoric period, with activity during the Bronze Age and Iron Age; the site has been subject to archaeological study and conservation work in the modern era.

Dún Aonghasa occupies a prominent headland on Inishmore in the Aran Islands off the west coast of County Galway.

• Access: A short uphill walk from the main village pier and visitor parking leads to the site, which sits on the western/cliff edge of Inishmore.

What to See #

• Concentric walls: A series of concentric dry-stone walls form the main defensive enclosures, arranged around an inner court on the cliff edge and providing the fort's characteristic profile.