The Mayan Code

We all know about the 2012 end of day Mayan prophecy and about their advanced knowledge of astrology. Why did they abandon their cities and temple? Much of the most important Mayan cities were not discovered until early 1900's. Many say there are much more secrets in the jungles the Guatemalan jungles to discover. The Mayas claim they came from the Pleiades star cluster, and that one day their ancientors Gods will return.