50km from Dublin Newgrange was constructed over 5,000 years ago (about 3,200 B.C.), making it older than Stonehenge in England and the Great Pyramid of Giza in Egypt.
Newgrange was built during the Neolithic or New Stone Age by a farming community that prospered on the rich lands of the Boyne Valley. Knowth and Dowth are similar mounds that together with Newgrange have been designated a World Heritage Site by UNESCO. Archaeologists classified Newgrange as a passage tomb, however Newgrange is now recognised to be much more than a passage tomb. Ancient Temple is a more fitting classification, a place of astrological, spiritual, religious and ceremonial importance, much as present day cathedrals are places of prestige and worship where dignitaries may be laid to rest.
The national bus company Bus Eireann have tours to both Newgrange and also the beautiful Glendalough in the Wicklow mountains
The website of Newgrange: http://www.newgrange.com/