Secrets of the Amazon-S20/E13

 The Amazon rainforest remains largely unexplored, but thanks to new technology, researchers are now finding that this dense jungle was once home to a vast network of cities.

Hidden Messages-S20/E12

 From colossal figures that can only be seen from the sky to complex crop circles that mimic sound frequencies, and mathematical messages encoded on opposite sides of the planet, could these sites hold clues about alien visitation?

Alien A.I.-S20/E11

 
The rapid development of artificial intelligence has made it a powerful tool for historians and archaeologists. But might it also reveal evidence of an extraterrestrial presence on Earth?

UFO Sightings-S20/E10

 

From footage of extraordinary aircraft taken by fighter pilots to mysterious glowing orbs that are reported all over the world, are these remarkable sightings evidence of extraterrestrial visitation?

Wars of the Gods-S20/E9

 Ancient legends describe a war in heaven that was fought by otherworldly beings with extraordinary weapons. Is it possible that our planet still bears the scars of battles fought by extraterrestrials?