Newgrange (Irish: Sí an Bhrú) is a prehistoric monument in County Meath, Ireland, located about one kilometre north of the River Boyne. It was built during the Neolithic period around 3200 BC, making it older than Stonehenge and the Egyptian pyramids. The site consists of a large circular mound with a stone passageway and interior chambers. The mound has a retaining wall at the front and is ringed by engraved kerbstones. There is no agreement about what the site was used for, but it has been speculated that it had religious significance – it is aligned with the rising sun and its light floods the chamber on the winter solstice. It is the most famous monument within the Neolithic Brú na Bóinne complex, alongside the similar passage tomb mounds of Knowth and Dowth, and as such is a part of the Brú na Bóinne UNESCO World Heritage Site.