TV Ancient Aliens - Season 2 Episode 8 : Unexplained Structures Ancient Aliens - Season 2 Episode 8 : Unexplained Structures 7/10 by 287 users If ancient aliens visited Earth, can evidence of their existence be found in the mysterious structures that still stand throughout the world? Inexplicably, megalithic structures found on different continents are strikingly similar, and the cutting and moving of the massive stones used to build these magnificent feats would be a struggle for modern day machinery, let alone ancient man. Ancient astronaut theorists suggest that the standing stones in Carnac, France were used as an ancient GPS system for ancient flying machines. The recently discovered Gobekli Tepe in Turkey, which has been dated back 12,000 years, has finely chiseled pillars that experts describe as a Noah's Ark in stone. Is it possible that extraterrestrials assisted primitive man in constructing these unexplained structures? If so, what was the purpose of these grand projects? Details Casts Posters Images Title Ancient Aliens - Season 2 Episode 8 : Unexplained Structures Alternative Titles Nos ancêtres les extraterrestres, 远古外星人, Ancient Aliens - Neue Erkenntnisse, Generacion alien, Alienígenas ancestrales, Alien Theory, 古代の宇宙人, Goście z Przeszłości, Drevni vanzemaljci First Air Date 2010-04-20 Last Air Date 2025-11-06 Number of Episodes 278 Number of Seasons 21 Genres Documentary, Mystery, Sci-Fi & Fantasy, Networks History, Casts Robert Clotworthy, Giorgio A. Tsoukalos, Ariel Bar Tzadok, Jonathan Young, David Childress, Erich von Däniken, Linda Moulton Howe, David Wilcock, George Noory, Philip Coppens, Nick Pope Plot Keywords , Narrator (voice) Robert Clotworthy Self Giorgio A. Tsoukalos Self Ariel Bar Tzadok Self Jonathan Young Self David Childress Self Erich von Däniken Self Linda Moulton Howe Self David Wilcock Self George Noory Self Philip Coppens Self Nick Pope Self Mike Bara Self Bill Birnes Self Hugh Newman Self Robert M. Schoch Self Nick Redfern Episodes List Ancient Aliens Season 2 :Episode 1 Mysterious Places Mysterious Places 2010-10-28 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 2 Gods & Aliens Gods & Aliens 2010-11-04 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 3 Underwater Worlds Underwater Worlds 2010-11-11 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 4 Underground Aliens Underground Aliens 2010-11-18 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 5 Aliens and the Third Reich Aliens and the Third Reich 2010-11-25 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 6 Alien Tech Alien Tech 2010-12-02 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 7 Angels and Aliens Angels and Aliens 2010-12-09 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 8 Unexplained Structures Unexplained Structures 2010-12-16 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 9 Alien Devastations Alien Devastations 2010-12-23 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 2 :Episode 10 Alien Contacts Alien Contacts 2010-12-30 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...