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For the most part, technology has continued improving in a pretty linear fashion for hundreds of years (except maybe in the case of Windows Vista). 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 that leave both cryptozoologists and mainstream scientists baffled.

Stonehenge



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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Roman concrete



When scientists discovered a sample of ancient Roman concrete in the Mediterranean Sea, they found that Roman methods were superior to ours, both in terms of durability and environmental safety.

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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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Sacsayhuamán



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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