While
Knowth is the most decorated of the three Brú na Bóinne
passage mounds, Newgrange does contain a large amount of decoration.
Some of this, as discovered during excavations by Michael O'Kelly
in the 1960s and 70s, was located at the rear of kerbstones,
hence it was not visible and lay hidden for five millennia until
the excavations programme. Inside the passage and chamber of
Newgrange, there are some well decorated stones. The photographs
here show selected examples of decorated stones in the chamber,
including the world-famous triple-spiral on the right-hand chamberstone
in the rear recess, and the ceiling stone of the eastern recess.
For an interpretation of megalithic art, see this
page.
Photos of the megalithic art inside Newgrange 
