Discover the astonishing purpose and influence of the greatest Celtic site in Europe in the only book written about this site in the English language * Why the Externsteine was the most sacred site of the primal European Celts, from about 2,500 BC? * Why do mystical texts of the Icelandic Edda refer to this site? * How did the high priestess of the Teutonic tribes cause the most catastrophic military defeat the Romans ever suffered? * Why did Charlemagne attack it, in his war against the Teutonic tribes? Discover: * Strange chambers designed for the solstice and lunar node observation * Carvings of hidden faces and mythological beings * A sarcophagus used for the mystical 3-day sleep * The most culturally significant pre-medieval Christian artwork in all of Europe * An ancient Celtic carving about a mystical initiation process.