Mussenden Temple is a small circular building located on cliffs near Castlerock in County Londonderry, high above theAtlantic Ocean on the north-western coast of Northern Ireland.

It was built in 1785 and forms part of the estate of Frederick Augustus Hervey, the 4th Earl of Bristol, Bishop of Derry. Built as a library and modeled on the Temple of Vasta in Italy, it is dedicated to the memory of Hervey's cousin Frideswide Mussenden.

Over the years the erosion of the cliff face at Downhill has brought Mussenden Temple ever closer to the edge, and in 1997 the National Trust carried out cliff stabilisation work to prevent the loss of the building.

The inscription around the building reads, "Tis pleasant, safely to behold from shore/ The rolling ship, and hear the tempest roar." The quotation is from Lucretius.

The Temple offers magnificent views westwards over Downhill Strand towards Magilligan Point and County Donegal and to the east Castlerock beach towards Portstewart, Portrush and [Fairhead].

http://en.wikipedia.org/wiki/Mussenden_Temple