For the summer solstice period, here is a deluxe version of the introduction to my book Mysterium Artorius: Arthurian Grail Glastonbury Studies, concerning the mystique of the Glastonbury and Tintagel landscapes as a doorway into a greater appreciation of our national mythos and how such sensibilities have inspired the great poets and composers. Includes mentions of Dion Fortune, John Cowper Powys, Elgar, Vaughan Williams, and Rudyard Kipling.