After the last April Fool's hoax, it is with some hesitation that I
refer you to an article in today's Irish Times. However, this one
seems to be genuine.
It seems that Dr. Phillip Stooke, a Canadian planetary cartographer,
has discovered that some of the rock carvings at the tumulus at
Knowth, in the Boyne valley, are depictions of the moon or, more
specifically, of the lunar 'seas'. The full article, including a
picture of the moon with Knowth carving superimposed, is at: