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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.

Ancient Achievements Still Unexplained By Modern Science
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?