cliffs around aran islands

Dun Aengus is a fantastic example of a stone fort which is thought to be over 2000 years old! It is perched on top of a cliff edge about 300 ft above the Atlantic Ocean.
The fort is said to have been built by Aonghusa who was a chief of the Fir Bolg - so it translates as the 'Fort of Aonghusa'.
The impressive stone fort has three enclosures to defend against the enemy. If you look closely enough at one of the walls you will notice vetical, jagged rocks pertruding at an angle....