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Carrowmore (Irish: An Cheathrú Mhór, 'the great quarter') is a large group of megalithic monuments to the west of Sligo, Ireland. They were built in the 4th millennium BCE, during the Neolithic era. There are thirty surviving tombs, making Carrowmore one of the largest clusters of megalithic tombs in Ireland.
Wikipedia: Link

A National Monument in the Republic of Ireland is a structure or site, the preservation of which has been deemed to be of national importance and therefore worthy of state protection. If the land adjoining the monument is essential to protect it, this land may also be protected.
A list of the monuments can be found at Link