Reveals how Stonehenge was an extraordinary astronomical calendar used in the cultivation of ingredients for long-forgotten botanical cures• Explores how Stonehenge and other stone circles were ancient healing sanctuaries and celestial calculators for the preparation of natural medicines• Explains how the megalithic priesthood--and their successors, the Druids--developed astonishing memory techniques to preserve knowledge over generations• Draws upon the very latest discoveries from recent archaeological excavations and overlooked historical source material