Mysterious North America: Mysteries, Legends, and Unexplained Phenomena across the United States, Mexico, and Canada

At a time in antiquity when most of Europe was covered with forests and wandering tribes, Mexico had already developed complex civilizations, beginning with the Olmecs and followed by the Maya, a civilization with advanced knowledge of medicine, engineering and astronomy. The Maya calculated the precession of the equinoxes and cycles of the Pleiades, on which they based their year, since they believed they had come from that constellation. The last, and perhaps most famous, great civilizati...