Mussenden Temple is located in the beautiful surroundings of Downhill Demesne near Castlerock in County Londonderry. It perches dramatically on a 120 ft cliff top, high above the Atlantic Ocean on the north-western coast of Northern Ireland, offering spectacular views westwards over Downhill Strand towards Magilligan Point and County Donegal and to the east Castlerock beach towards Portstewart, Portrush and Fair Head.
The Temple was built in 1785 and forms part of the estate of Frederick Augustus Hervey, Bishop of Derry and Earl of Bristol (or the Earl Bishop). The temple was built as a summer library and its architecture was inspired by the Temple of Vesta in Tivoli, near Rome. It is dedicated to the memory of Hervey's cousin Frideswide Mussenden.