During the 9th century, the hill town of Siena in central Italy became a major stopping point on the road between Rome and Paris. During the 12th century, the city began building a series of outstanding churches, towers and public squares, and since most of the modern construction has taken place outside the old city, Siena's character remains relatively unspoiled. Burt Wolf tours the narrow winding streets and ancient buildings, looks at the history of St. Catherine and St. Bernardino, investigates a horse race that's been used to settle grudges for over 700 years, and learns how a church, a synagogue or a mosque can help us counter the effects of time.