
Newgrange (Sí an Bhrú) is a prehistoric monument in County Meath, Ireland, about one kilometre north of the River Boyne. It was built about 3200 BC, during the Neolithic period, which makes it older than Stonehenge and the Egyptian pyramids. Newgrange is a large circular mound with a stone passageway and chambers inside. The mound has a retainin...
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http://en.wikipedia.org/wiki/Newgrange

Outstanding Neolithic passage-grave and the world's oldest known astronomical observatory; one of four great Neolithic burial mounds in the
Boyne Valley necropolis, 3 km/5 mi east of Slane, County...
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http://www.encyclo.co.uk/local/20688

the largest of three mound-covered passage graves on the river Boyne in county Meath, Ireland, built c3000b.c., having a corbeled roof and hammered geometric engravings and containing traces of cremation burials.
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https://www.infoplease.com/dictionary/newgrange
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