[SatinDoll]

Was there an explanation on why there was a fortress on the Atlantic shore of Inishmore? Like, who they feared would invade or were at odds with at the time?

That edifice indicates a huge expenditure in manpower and effort. There had to be a very good reason for its existence.

[ConorMacNessa]

There is much speculation as to the reason for its location. A portion of the structure has fallen into the Atlantic as the limestone underpinning the cliffs is worn away by the sea:



Link to Wikipedia article:

http://en.wikipedia.org/wiki/D%C3%BAn_Aonghasa

America demands Justice for the Fallen of Benghazi!

Genuflectimus non ad principem sed ad Principem Pacis!

Listen, O isles, unto me; and hearken, ye people, from far; The LORD hath called me from the womb; from the bowels of my mother hath he made mention of my name. (Isaiah 49:1 KJV)