Griff Rhys Jones returns with a new series in which he explores some of the world's most exciting cities. His journey starts in Rome, the eternal city. Over two thousand years old, it is home to 2.5 million people, and Griff discovers what life is like for the citizens who are living in what is effectively the world's largest museum. He also learns how to direct traffic at Europe's busiest road intersection, meets a silent order of nuns, and talks to the city's mayor about the smooth running of a city that is a miraculous blend of ancient and modern. And finally, he witnesses the passage of the Madonna icon down the Tiber to be received by the enthusiastic hordes in Rome's city centre.

• Griff Rhys Jones