Ancient Aliens: Special Presentation: Temporada 1, Episódio 7

1 - 7: Alien Codes and Messages

From the furthest reaches of human history, our ancestors left curious carvings, geo-glyphs, and hieroglyphic messages for future generations to decipher. Is it possible that these mysterious inscriptions, enigmatic crop formations, and encoded sacred architecture signify communication with extraterrestrial visitors? And if so, just what are they trying to tell us?