The Vatican City became a state within a state in 1929 although it goes back further in history. It is probably one of the richest countries in the world for its size in addition to its many priceless treasures. The Sistine Chapel, Vatican Library and Museums, and, of course, St. Peter's Basilica are seen in this area.
It stretches 109 acres and even has its own postal system, separate to that of Rome and also, jail and service station etc. for those who reside on the inside.
As you can see from the phot below, the grounds are maintained to the highest of standards and it seemed like there is a whole new world inside.