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If you're into postal history or collectibles, check out the Smithsonian's National Postal Museum. This extensive site hosts collections of artifacts related to postal operations and philatelic history, and permanent and temporary exhibits of objects related to all aspects of U.S. postal history.

Cheryl Ganz is chief curator of philately at the Smithsonian National Postal Museum, which is open every day of the year except Christmas; admission is free. On November 4, 2009, we spoke with her by telephone to talk about zeppelin stamps … Read more »