Fullers Folly is located south-east of the Desmond Castle. The man behind the construction of Fullers Folly was William Fuller Hartnett born in 1804. It is believed that Fuller had a disagreement with the Castle Authorities and as a result built this castle as a form of revenge or a hint to them. It was a costly structure with little or no use, hence 'Folly'. Fuller died in 1879, and was buried in Churchtown graveyard.