It has been said that the megaliths on greencastle hill in anu were not put there by mere motal man but actually grew out of the earth,if by a natural cause or by a mystical phenomenon. Some believe they were put there by God.  These stones are connected with the celestial luminaries and can tell about the weather. There are few places on this planet earth which carry the trade mark of these stones,so that shows that these stones are there for a specific reason.