What is "loughcrew"

thumb Loughcrew is near Oldcastle, County Meath, Ireland. (Sometimes written Lough Crew). Loughcrew is a site of considerable historical importance in Ireland. It is the site of megalithic burial grounds dating back to approximately 3500 and 3300 BC, situated near the summit of Sliabh na Caillí and on surrounding hills and valleys. Passage tombs on the site are aligned with the Equinox sunrise.