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Megalithic Grass Covered Passage Tomb. The Megalithic Passage Tombs Of Newgrange, Knowth, Dowth Are In County Meath In Ireland`s Ancient East. 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.