Siena's 13th-century Gothic cathedral, with its striped tower, is dedicated to the Virgin Mary and covered with art. A highlight is the church's Piccolomini Library: Brilliantly frescoed, it captures the exuberance and optimistic spirit of the 1400s, an age of humanism when the Renaissance was born. At http://www.ricksteves.com, you'll find money-saving travel tips, small-group tours, guidebooks, TV shows, radio programs, podcasts, and more on this destination.