Dún Aonghasa is situated on the cliff side or south side of Inismór. It is a semi circular stone fort over looking the Atlantic. Excavations carried out in the 1990s indicated that people had been living at the hill top from c.1500 BC with the first walls and dwelling houses being erected c. 1100 BC. A remarkable network of defensive stones known as a Chevaux de Frise (c.700 BC) surrounds the whole structure.
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