In 2009, I featured photochromes from the archives of the Library of Congress and New York Public Library. Putting together my recent post on Room 26 Cabinet of Curiosities, I came across another large batch of them: About 1100 Detroit Photographic Co. photochromes in the Beineke Rare Book library. (Search for "Detroit" to call them all up.)

Photochromes (or "photochroms") were popular between about 1890 and 1910, passed around the world as postcards.