Vatican tunnel

The Vatican is the smallest state in the world, both in area and population: it has less than 110 hectares and a population of 1,000 people. Still, its small size is no laughing matter – the Vatican is filled with historic buildings, monuments and other architectural works of art. From St. Peter's Basilica and the Sistine Chapel to the Vatican Library and Vatican Museums, the small country is rich in monuments. However, most people don't know about one of the Vatican's best-kept secrets, a secret tunnel called Passetto di Borgo.