Some stories end with a question mark instead of a period. They're the events that haunt history, leaving behind an echo of what we don't know. A famous thief walks away with a masterpiece, and it's never seen again. A pilot vanishes over the ocean. A strange signal from space is heard just once. The 24 mysteries you’re about to read are more than just cold cases as they are also gaps in our understanding of the world, reminding us that not every puzzle was made to be solved.

Author and publisher Byron Preiss created an elaborate nationwide puzzle in 1982, by publishing 'The Secret: A Treasure Hunt,' a book containing twelve cryptic poems and twelve intricate paintings. Each pairing of verse and image supposedly leads to a ceramic casque buried in a North American park, which could be exc

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