Newgrange, Ireland

Newgrange, Si an Bhrú, is a prehistoric monument near the River Boyne in Ireland.  It was built by Stone Age farmers around 3200 BC during the Neolithic period which makes it older than than Stonehenge or the Pyramids of Giza.

The site is a large circular mound 85 meters (93 yards) in diameter and 13,5 meters (15 yards) high on about an acre.  There is an inner stone passageway and chambers.

No one really knows what the site was used for.  The entrance is aligned with the winter solstice so that once a year sunlight shines through into the inner chamber.

Newgrange was declared a UNESCO World Heritage Site in 1993.  Here's a National Geographic video that I found out on YouTube.

©National Geographic