Host Mark L. Walberg welcomes ANTIQUES ROADSHOW viewers to Louisville, Kentucky, home of the world-famous Kentucky Derby. It's also the birthplace of boxing legend Muhammad Ali, and Walberg and appraiser Mike Gutierrez head for the Muhammad Ali Center to talk about collecting memorabilia of the former World Heavyweight Champion. At the Kentucky International Convention Center, appraisers are off to the races with such winning discoveries as valuable original cover art for The Saturday Evening Post by John Falter, brought by his stepdaughter, who modeled for the illustration when she was five years old; an early 19th-century embroidered silk mourning picture; and an enduring symbol of the Kentucky Derby: an heirloom mint julep cup created by Louisville silversmith William Kendrick in the mid-19th-century, estimated to be worth $2,000.