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7 Ancient Achievements Still Unexplained By Modern Science

For the most part, technology has continued improving in a pretty linear fashion for hundreds of years. But sometimes an ancient structure or invention is uncovered that seems a little too advanced for its respective era.
Cryptozoologists often use this as evidence of alien intervention, but scientists are quick to say that's not the case, even without providing a more logical explanation. Here are some crazy ancient achievements

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    Probably the most famous ancient marvel in the world, Stonehenge may look like a simple pile of rocks, but it's actually an ancient astronomical observatory. By moving these stones once a year, the ancient people were able to predict the movements of the moon. How'd they ever figure that one out? And more importantly, how did they even manage to move the immense stones in the first place?

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    The Gate of the Sun

    This archaeological marvel comes from the Tiwanaku, which was a civilization that lived in modern-day Bolivia before the Incas. Their work appears to outshine even the Aztec's in terms of technological know-how. For instance, one of the quarries where the stones for this arch were found is 50 miles away from the site. That seems a bit too far for a civilization that didn't even make use of animal labor to drag the stones.

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    The Great Pyramid of Giza

    This pyramid was the largest man-made structure in the world for 3,800 years. Baffled scientists are still trying to figure out what techniques were used in its construction.

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    Antikythera mechanism

    Dated between 150 and 100 B.C., this device found in Greece is considered to be an ancient analog computer that predicts astrological positions. It uses a complex series of gears that is far more advanced than the technology scientists believe was available to them at the time.

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    This ancient Peruvian site has confused archaelogists for quite some time, as the giant stones in the wall are so close together that not even blades of grass can slide between them. It has also survived for thousands of years with no visible mortar keeping it together.

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    Iceland spar

    It was long held in ancient Nordic myth that a magic gem was used to navigate the seas in low-visibility situations. Scientists have recently figured out that this gem is real and is more deeply rooted in science than magic. The Iceland spar refracts light to make it visible in cloudy or nighttime conditions.

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    Baghdad battery

    Elon Musk might be at work perfecting the electronic battery today, but as early as 250 B.C., clay batteries were used in an ancient town near Baghdad that could produce at least two volts of electricity. What could they possibly have been powering back then? Nobody knows.

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