An underwater post office seems like something from science fiction, but it's actually a real place in the small island nation of Vanuatu -and that's only one of ten crazy post offices located across the globe. Also strange is the world's only floating post office, that only serves freighters traversing the Detroit River. If you like things a little more old school, you might enjoy the post office in Peach Springs, Arizona that delivers mail with a mule team to the bottom of the Grand Canyon. Believe it or not though, those three examples aren't even the most out of this world post offices around.
So check out the full list of ten crazy post offices on TopTenz.