Slide containing the microphotograph


The image on the microphotograph

Image description: This microphotograph, pictured next to a penny to show the scale, is only 1 millimeter wide and possibly the smallest image the Library of Congress owns. When magnified, you can see people standing in front of a building, a mental hospital. It was taken in Philadelphia around 1858.

Learn more about this microphotograph.

Photos from the Library of Congress Prints and Photographs Division

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