ANTIQUES ROADSHOW is in Birmingham, where host Mark L. Walberg heads to the historic site of Sloss Furnaces with appraiser Stuart Whitehurst to learn about iron antiques and the history of the iron and steel industry. Highlights include 1968 letters from a young Bill Clinton that include his candid opinions on politics and war; a Lalique hood ornament in an uncommon amethyst color; and a 1952 John Falter illustration valued at $200,000 to $250,000 in today's hot illustration art market.