I got this from Wilmette, a superb blog that I read regularly.
It's the final resting place of countless Stone Age dead, but mystery still lives at Ireland's Newgrange tomb.
Scientists have long been puzzled by the massive 5,000-year-old mound, but one revelation shed a lot of light—literally—on the meaning of the crypt. On the winter solstice, the shortest day of the year, a beam of sunlight reveals a corridor that leads to a cache of ancient bones.
Tour the halls of Newgrange, and explore the deep mysteries of one of Europe's most puzzling Stone Age sites.
Watch this amazing video in the National Geographic website
Read more about Newgrange in the wikipedia site