During his life, the ever popular T. Lobsang Rampa spoke of many mystical experiences which had taken place while he was head of the highest secret spiritual order in Tibet. Nowhere, however, in all his writings did he dare mention the most incredible episode of his lengthy career as a Tibetan Lama. In fact, only in hushed whispers did he dare tell his closest disciples about his amazing voyage from a point inside a hidden valley -- near the interior of our world -- to the third planet from the sun. In this volume, Rampa describes his meetings with highly advance terrestrial philosophers and scientists, and his feeling that these beings have been arriving on Earth for centuries for the general well being of humankind. Some students of Rampa's writings may be shocked by these revelations. They may think that they transpired during out-of-body experiences, while others will go along with the noted mystic's claim that he took such a trip in his physical body.