Hideaway Island, Mele

Condé Nast TravelerOct 13, 2025

Send snail mail from high up in the mountains or under the sea at these postal landmarks around the world.

Islet with the world's only underwater post office.

7 things in this story

Hideaway IslandSightIslet with the world's only underwater post office.
Elsewhere
Eiffel TowerSightParis, FranceTower with a first-level post office.
Port LockroySightGoudier Island, AntarcticaWorld's southernmost post office, museum, penguin colony.
North Everest Base CampSightTingri, ChinaLocation of the world's highest temporary post office.
Dal LakeSightSrinagar, IndiaLake with a floating post office.
Postojna CaveSightPostojna, SloveniaCave system with an underground post office.
MolokaiNeighborhoodHoolehua, United StatesIsland with a post office that mails coconuts.

Hideaway Island