''Unexplained Structures'' is one of the episodes of the second season of the documentary called ''Ancient Aliens'' produced by Prometheus Entartainment and first premiered on April 20,2010 on History Channel.

This episode suggests that various sites around the world; such as Gobekli Tepe in Turkey; Inca ruins of Sacsayhuaman in Peru; the Carnac stones of France; and Zorats Karer in Armenia, show construction techniques and mathematical concepts that were not believed to have been known at the time.

Gobekli Tepe, Turkey
Carbon dating of organic matter adhering to the megaliths shows that the complex is 12,000 years old. That is to say, it was built around 10,000–9,000 BC. By comparison, Stonehenge was built around 2,000–2,500 BC. Prior to the discovery and dating of Gobekli Tepe, the most ancient megalithic complex was thought to be in Malta, dated around 3,500BC.
Gobekli Tepe is thus the oldest such site in the world, and by a considerable margin. In fact, it’s so stupefyingly old that it actually predates settled human life. It is also pre-pottery. Gobekli Tepe hails from a part of human history that is unimaginably distant, right back in our hunter-gatherer past.

Incan Ruins, Peru
This archaeological site contains unusual Inca ruins, mostly consisting of several enormous terraced circular depressions. It is thought to have been built by the predecessors of the Inca Civilization over 2,000 years ago.
Carnac Stones, France
More than 3,000 prehistoric standing stones were erected at some stage during the Neolithic period, probably around 3300 BC, but some may date to as old as 4500 BC.
Local tradition claims that the reason they stand in such perfectly straight lines is that they were a Roman legion turned to stone.
Zorats Karer (Karahunj), Armenia
This site with about 223 large stone tombs was explored by a team of archaeologists from University of Munich which they concluded it was mainly a necropolis from the Middle Bronze Age to the Iron Age and added it may have served "as a place of refuge in times of war", possibly in the Hellenistic-Roman, 300 BC - 300 AD.About 84 of the stones feature a circular hole, although only about 50 of the stones survive. They have been of interest to Russian and Armenian archaeoastronomists who have suggested that the standing stones could have been used for astronomical observation.

Stonehenge, England
One of the most famous sites in the world, Stonehenge is composed of a circular setting of large standing stones. Archaeologists have believed that the iconic stone monument was erected around 2500 BC.
Stonehenge was constructed in three phases and has been estimated that the three phases of the construction required more than thirty million hours of labour. Speculation on the reason it was built range from human sacrifice to astronomy.

You can find all episodes of the program on YouTube, presenting theories of ancient astronauts and proposes that historical texts, archaeology and legends contain evidence of past human-extraterrestrial contact.

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