With unprecedented access to the Vatican and the people who live there, this is a unique profile of the heart of the Catholic Church and the world's smallest sovereign state.

With unprecedented access to the Vatican and the people who live and work there, this is a unique profile of the heart of the Catholic Church and the world's smallest sovereign state.

Archivists reveal the Vatican's secrets, including the signed testimony of Galileo recorded by the Inquisition. A cardinal journeys deep below St Peter's Basilica to inspect the site claimed to be the tomb of the saint himself, and curators share a private viewing of Michelangelo's extraordinary decoration of the Sistine Chapel.

An intriguing behind-the-scenes look at the workings of one of the world's most powerful and mysterious institutions.