The huge decorated stone, originally, would have been climbed over to access the tomb and then the huge slab at the side of the entrance would have to be moved aside. The square entry above the 'pedestrian' entry allows the dawn sun, at the Winter Solistice (approx. 21 December) to shine down the 19 metre passage to illuminate the burial chamber. This suggests to archaeologists that the burials must have been associated with a religion based on the sun. Photography inside the tomb was not allowed, which is a pity, since the domed roof of the burial chamber is very interesting - there's a picture here (https://deirdremorgan1.files.wordpress.com/2014/04/corbelled-vault-at-newgrange.jpg) - and the chamber and the passage are still waterproof after 5,000 years.
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