The smallest post-office in the world is kept in a barrel, which swings from the outermost rock of the mountains overhanging the Straits of Magellan, opposite Terra del Fuego. Every passing ship opens it to place letters in or take them out. Every ship undertakes to forward all letters in it that it is possible for them to transmit. The barrel hangs by its iron chain, beaten and battered by the winds and storms, but no locked and barred office on land is more secure.

— Frank H. Stauffer, The Queer, the Quaint and the Quizzical, 1882