The center of Newgrange is this symbol carved into stone.

The Triple Returning Spiral,

was carved in the one place that the sunlight illuminates once per year at the Winter Soltice.
Obviously, this is the holiest and most important message that the ancient Irish
wanted to pass along to their descendents with the Winter Soltice beginning
the approach of the returning Springtime. This is a message of re-newed Life, regeneration
and immortality. From out of the darkness, the Winter Soltice sun
shines directly upon a symbol of Life.

But this is more than just an empty symbol; it is the White Man's road map that shows you
the Ancient Way to Spiritual Knowledge, Good Health, Martial Prowess and Immortality.
It is a road map of a secret and genuine power hidden within yourself.
All you have to do is look for it and follow the Internal Path to find your True Self,
your Spiritual Self, your Immortal Self.