We’ve had several breakthroughs in modern times. The internet. Wi-Fi. Animal to human organ transplants. Cloning. Most of these sounded like unimaginable inventions in the past, but with how rapidly we’re advancing, they are to be expected.

However, these discoveries seemed too improbable to have been invented in ancient times. In fact, most of these inventions gave way to the birth of things we continue to use to this day.

From Greek fire to automated doors, here are 20 ancient technologies far too advanced for their time.

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~ Top Generality