Niuafo’ou is an isolated volcanic island in the Pacific with no harbor. Since 1882, it has been getting its mail via “tin can,” i.e. sealed inside a biscuit tin, or other watertight package and either carried to shore by a swimmer or brought in by canoe. Postal fans all over the world have posted letters to Niuafo’ou to garner the coveted “Tin Can Mail” stamp on their envelopes. There’s a marvelous history here, and above, a real photo postcard from the 1930s.