Like gems of the mineral world, these stamps and pieces of mail are rare and highly valued.
They tell stories about important moments in U.S. history, from the Stamp Act and the American Revolution to the Apollo 15 Moon landing. Each one conveys significant information about stamp design and production, including one of the most famous stamp printing errors ever made.
The Inverted Jenny exhibit.
Hawaiian Missionary stamps exhibit.
Gems of American Philately exhibit.