- Newgrange, Co. Meath -
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Newgrange is a more famous passage tomb near Knowth. Its interior has been miraculously preserved since 3200 BC, when it was built. In over 5,000 years, not one drop of rain has entered the tomb, even though it is built of loose, flat stones without mortar, etc. The construction of the tomb is predicated on astronomical phenomena - the passage and chamber are illuminated by the winter solstice sunrise.