About Newgrange, National Geographic (click here)
The ceiling of Newgrange is corbelled roof, jokingly referred to the driest roof in Ireland ;)
At the end of the passage there are three chambers.
These chambers contain basins, with burnt remains of five (?) humans, along with pieces of jewellery.
So it is presumed that this is a burial chamber of sorts.
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This is the stone at the back of the building, again showing Spirals, Lozenges or Zig-Zag formations.
Again this "Zig-Zag" motif is found on the entrance stone and repeated along the passage and again inside the chamber.
OK, so here is the "new" part of our understanding.
This is an interesting theory but remember it is only a theory, for now anyway.
I have heard that the resonant frequency of the inside of the man made passage was constructed in such a way that the reverberations produce some unusual and interesting effects.
The resonant frequency is 110hz, the frequency of the male baritone, the second lowest singing voice (chanting).
And when the inside of the passage is filled with smoke or mist, the resonant frequency reverberates turning the smoke into the Zig-Zag formation!.
"Archaeologists have suggested that chanting, singing and drumming at these sites would have produced reverberating echoes that might have been interpreted as voices of spirits or gods; they may also have induced physiological and psychological changes in people, adding to their potency as sites of spiritual importance.
These acoustic discoveries may also shed light on some of the visual motifs etched into the walls of many ancient sites. Experiments in a replica of the Newgrange passage, at Princeton University, showed that if a site was smoky or misty, standing sound waves would become visible as they vibrated particles in the air. Could this visualising effect account for the zigzag and concentric ring markings on the chamber walls? "
From The Guardian (click here)
Also some more information can be found Here and Also from here and From here.
Just imagine over 5000 years ago these people built this monument for their dead, with materials from all over the country.
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Newgrange is not alone, it is just one piece of a much bigger puzzle.
There are other passage graves in this area, such as Knowth
 
and Dowth
 
[url=http://www.knowth.com/fourknocks.htm]
Fourknocks[/url]
 
Built at the same period these make a much larger complex.
"It is clear from the orientation of the passage-mounds that the whole complex was devoted to accurate measuring of both the lunar and solar cycles simultaneously."
Celestial significance?.
A giant warrior in the Landscape (click here)
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I have a keen interest in this topic and have studied quite a bit and I am trying to get across the most interesting parts, to create an interest.
It stirs the imagination to wonder why, how and about that period of history.
I personally believe that a lot of knowledge has been lost and here we have a trace, a glimpse in to the past.
I would have loved to have known what Nikola Tesla and his study of frequency could have brought to this.
There used to be a huge backlog of ticket holders to see Newgrange from the inside on the winter solstice, so now the tickets are given by lottery.
Admission to the chamber of Newgrange for the Winter Solstice sunrise is by lottery. Application forms are available at the reception desk in the Brú na Bóinne Visitor Centre. County meath, IrelandFrom here
All I ask is that do not touch the stone, it has lasted for over 5000 years, it would be great if it could last another 5000 years.
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Also worth mentioning are all the Dolmens (Portal tomb ) Most date from the early Neolithic period (4000 to 3000 BC) 
Court tomb,  There are over 350 known court-tombs in the whole of Ireland.
and Wedge tomb. 
Of course similar constructions can be found in other parts of Europe and indeed the world but my focus is on Ireland.
Which is rich in prehistoric myths and legends about these enigmatic people and structures.
For an example these were referred to as fairy mounds.
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