The great lights that have come out of the world's spiritual traditions and graduated from earth's schoolroom are known as ascended masters. They demonstrate to us that in the world of Spirit, there is no division of race, religion or philosophy. What is not widely known about these great masters is that they have retreats--temples and cities of light in the heaven world that can be visited during spiritual meditation and while our bodies sleep at night. In this comprehensive work, the authors speak about these masters, the stories of their lives and their incredible retreats. More than 200 illustrations.