The smallest country in the world and is located within a walled area of the Italian capital city of Rome. Its area is only about .17 square miles (.44 square km or 108 acres).

Vatican City has a population of about 800, none of whom are native permanent residents. Many more commute into the country for work. The Vatican City officially came into existence in 1929 after the Lateran Treaty with Italy. Its government type is considered ecclesiastical and its chief of state is the Catholic Pope. The Vatican City is not a member of the United Nations by its own choice.

via The World’s Smallest Country – Vatican City or Holy See.