This national monument is the Beltany Stone Circle, located in Raphoe in co.Donegal. It dates from between c.1400 b.c > 800 b.c and is one of the largest and earliest stone circles in Ireland with a diameter of 145 feet. It originally comprised of 80 upright stones of which 64 still stand and probably dates from the later Bronze Age (circa 1400 to 800 BC). The name ‘Beltany’ derives from the spring festival of Beltane which marked the sunrise on the first day of May. A carved stone known as ‘The Beltany Stone Head’ was found at this site and probably dates from the pre-Christian Iron Age period between 400 bc and 400 ad. This sculpture probably depicts a god associated with the stone circle. Five of the stones are also decorated with prehistoric art known as cup marks.The site was therefore in use for hundreds, if not thousands of years after it was built.