Newgrange is a large Neolithic monument located in Ireland that was built around 3200 BC, making it older than both the pyramids of Egypt and Stonehenge. It sits atop a ridge along the Boyne River and consists of a large mound covering an inner chamber and passageway. During the winter solstice, sunlight enters through a small opening and illuminates the interior of the chamber for approximately 17 minutes. The complex construction suggests it was built by a highly organized community and may have had astronomical or religious significance.