First English translation of the book that introduced the realm of Hollow Earth * Explores the underground world of Agarttha, sometimes known as Shambhala, a realm that is spiritually and technologically advanced beyond our modern culture * One of the most influential works of 19th-century occultism * Written by the philosopher who influenced Papus, Rene Guénon, and Rudolf Steiner The underground realm of Agarttha was first introduced to the Western...