In Japan there is an underwater mailbox. Up to 1500 letters are dropped here by divers each year.
Mail was delivered 12 times a day in Victorian London, with immediate responses often expected, and people got upset if letters weren’t received within a couple of hours.
An Australian man in London, desperate not to miss his daughter’s birthday back home, posted himself to Australia in a crate which he helped design and build. He amazingly survived the three days journey and became a news sensation in 1964.
In 1930 the US government barred and returned any mail from Spain bearing a new set of stamps, which showed a world-famous painting of a naked woman.
Mailing an entire building has been illegal in the U.S. since 1916 when a man mailed a 40,000 ton brick house across Utah to avoid high freight rates.
In 2003, a man mailed himself to Texas from New York.
People play chess through snail mail.
There are still two places in the US which have their mail delivered by mules.