In recent years Celtic spirituality has attracted a great deal of interest, and has been regarded as a manifestation of a world religion that can be seen as separate from Christianity as well as being linked to it. In pre-Christian Ireland, the Celts had their own sophisticated rituals of worship, as sites like Newgrange in the Boyne Valley, which predates the Pyramids of Egypt, make clear. The seasons, astronomy, nature and their perception - as...