20 most mysterious books in history

When books are hidden for centuries or shrouded in some sort of secrecy, many people begin to imagine that they must hold all the secrets of the universe. Maybe so, but these pesky things just refuse to give up all their secrets without a fight. And some of them, well, turn out to be a bunch of old cobblers anyway.

From a book buried underwater for 327 years to the Pope's secret underground library, here are the 20 most mysterious books in history.

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