Dun Aengus
County Galway, Ireland
Dún Aonghasa (unofficial anglicised version Dun Aengus) is the best-known of several prehistoric hill forts on the Aran Islands of County Galway, Ireland. It lies on Inis Mór, at the edge of a 100-metre-high (330 ft) cliff. A popular tourist attraction, Dún Aonghasa is also an important archaeological site.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).