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What if life on Earth began in outer space? Millions of people accept the theory that intelligent life forms visited Earth thousands of years ago and were worshiped as gods by primitive man. Are monuments like Stonehenge and Easter Island the last remains of an ancient alien visitation? From unexplainable super structures, to knowledge of the solar system, mathematics, and even the ability to make electricity, this special explores evidence of super-human influences on ancient man and embarks on an around-the-world search for answers.

Watch The History Channel - Ancient Aliens Season 2 Episode 8 - Unexplained Structures online for free streaming HD HQ
Watch The History Channel Ancient Aliens Season 2 Ep 8 Part 2 of 5 online for free streaming HD HQ