Greatest Mysteries

Greatest Mysteries: Smithsonian

Host Don Wildman explores the largest museum and research complex in the world, The Smithsonian Institution.

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National Postal Museum
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Photography by Raymond Boyd/Getty Images

Housed in the Old Post Office in Washington, DC, is the National Postal Museum. Here, true treasures of the American mail system are meticulously preserved -- from mail that travelled on the Hindenburg, to letters carried by Amelia Earhart.

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