The Vatican City is an independent country, with just a few dozen acres or so. It has a post office, and two wet bars( maybe only one by now). It is the only country in the world where the ATM's use the Latin language.

There are actually two (not one) big-deal Vatican banks- one is officially owned and headed by the Pope, making him technically the worlds richest individual.

The Vatican has been the subject of an on-going lawsuit over billions of dollars of wealth that was transferred to it in the closing days of WW2 ( A fleeing caravan from the Nazi puppet government of Croatia was intercepted and the booty taken to the Vatican.This wealth really belongs to elements of the former Yugoslavia and was stolen and is now hoarded by the Catholic church).