The Mayan Calendar and the Return of the Extraterrestrials. High up in the Bolivian Andes - 4,000 meters above sea level - lies Pumapunku, an ancient ruined city that simply could never have been onstructed by its Stone Age inhabitants. Erich von Daniken, bestselling author of 'Chariots of the Gods', returns with this explosive expose of our past...and our future.