Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More!

Investigate why the Mayans used several calendars with no apparent solar connection - and how one of their calendars points to a mysterious date in our past. in this digital exclusive from Season 14. #AncientAliens
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