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Billed as Ireland’s most visited natural attraction, the Cliffs of Moher are a 5 mile stretch of almost sheer cliffs consisting of bands of sandstone, siltstone, mudstone and shale rising to a maximum height of over 700 feet. They take their name from a former fort called Moher (or Mhothair) which stood on the Hag’s Head, at the southern end of the line of cliffs, but which was demolished in 1808, during the Napoleonic Wars, to be replaced by the signal tower that now stands there. Near the highest point stands O’Brien’s Tower, built in 1835 by Cornelius O’Brien as a viewing point for tourists.