The Cliffs were originally a huge river delta but over 320 million years they formed into what they are now, standing at 214m (708 feet),at the highest point.
A long long long time ago (1st Century BC) Fort Mothar stood, but during the Napoleonic wars it was demolished to make room for a signal tower (1803).
Luckily the original fort was use to generate the name of the cliffs, Cliffs of Moher.
Not only are the Cliffs in great position for towers and forts, it also is a sea bird haven!
The area is designated as a Special Protection Area (SPA) for birds under the EU Birds Directive in 1986. Some of the seabirds found are the Atlantic Puffin, Razorbill, Chough, and the Common gull.
In 1835 O'Brien's Tower was built, by Cornelius O'Brien (sort of rolls off the tongue, right?).
Cornelius was a descendant of Brian Boru, Kings of Thomond, He built the tower to serve as an observation point. During that time hundreds of tourist came to stand gallantly on the majestic Cliffs of Moher.
http://www.cliffsofmoher.ie/TheCliffs.aspx
Pictures taken by yours truly!