During World War II, service members could record personal messages onto mailable phonograph albums, address the discs, and send their voices through the post.
When banks failed during the Great Depression, communities created local currencies on materials including clamshells, oyster-shaped wood, and thin wooden pieces.
The Harpers Ferry engine house where John Brown's raid ended was dismantled for the 1893 Chicago world's fair and moved repeatedly before returning near its original site.
Railway Mail Service trains used catcher arms to snatch waiting mail pouches from trackside cranes at speed while clerks kicked the town's incoming bag off the moving car.
Reginald Bray tested British postal regulations by sending unusual objects through the mail—including, with the help of a friend, himself as a human letter.