At just 0.49 square kilometers (0.19 square miles), Vatican City is the smallest country in the world. It's also home to one of the easiest "maps" you'll ever interpret—when it comes to religion, the entire country is essentially one color.
That shouldn't come as much of a surprise. Vatican City exists as the sovereign headquarters of the Roman Catholic Church, serving as the residence of the Pope and the administrative center of a faith followed by more than 1.4 billion Catholics worldwide. Nearly everyone who lives or works within its walls is connected to the Church through religious, diplomatic, or administrative roles.
The Vatican became an independent state in 1929 after the signing of the Lateran Treaty between the Holy See and Italy. Despite its tiny size, it functions as a fully sovereign nation with its own government, postal service, radio station, railway, and the famous Swiss Guard, which has protected the Pope since the early 1500s.
A fun fact is that Vatican City has no permanent neighborhoods in the traditional sense. Its population of around 800 people is made up primarily of clergy, members of religious orders, Swiss Guards, and Vatican employees, many of whom receive citizenship only while serving in their official roles.
Some maps are designed to reveal surprising patterns, while others simply confirm what we already know in a memorable way. This one does both, using a touch of humor to highlight the unique role Vatican City plays as the spiritual heart of the Catholic Church.