These mysteries may never be solved. Welcome to WatchMojo, and today we’re counting down our picks for the greatest unsolved mysteries and strangest secrets from ancient times through today. Our countdown of world secrets that will never be revealed includes Metro-2, The Coca-Cola Recipe, Bohemian Grove, The Man in the Iron Mask, Freemasons, and more! Are you a super sleuth with knowledge of some of the world’s greatest untold secrets? Spill the beans in the comments below.

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