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The Megalithic Passage Tombs of Newgrange, Knowth, Dowth, Fourknocks, Loughcrew and Tara are located in the present day County of Meath on the east coast of Ireland. The Boyne Valley Mounds at Newgrange, Knowth and Dowth were built around 3200BC making them older than Stonehenge in England and the Pyramids of Giza in Egypt.