Newgrange was built between circa 3100 and 2900 BCE, during the Neolithic period, in order to house the remains of the dead. It has also been speculated that it had some form of religious significance, particularly in regards to an afterlife, because it is aligned with the rising sun on the winter solstice, which floods the tomb with light.It is in fact just one 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