Book excerpt: Breakthrough research on the ultimate purpose and function of the Glastonbury Tor. Glastonbury Tor is acknowledged to be one of the most powerful spiritual places in the British Isles. Wreathed in mystery since before recorded time, myths and legends abound about its role in the spiritual life of the people of these islands and beyond. Drawing on new research and previously unpublished sources, the author's dramatic conclusions have profound implications for the study of sacred sites worldwide, as he challenges beliefs about the interaction between the worlds of body and spirit.