The state also has its own religious laws. Its total area is 400 square kilometers and less than 1,000 citizens live in its territory, all of them religious figures. The Vatican City serves as the center of Catholic Christianity in the world. This is also why, by the way, there are quite a few interesting religious sites to visit: St. Peter's Basilica and St. Peter's Square, the Vatican Gardens and of course the Sistine Chapel.
Do not missunderstand, even though the pope is a sort of "prime minister" of Vatican City, this area is considered part of Rome. Though of course the Pope has everything he needs here-a house, churches, and offices.