Washington, D.C. - Hour 1 Antiques Roadshow : Season 15 Episode 16

Part 1 of 3 in Washington, D.C., features a 1958 letter from Martin Luther King Jr.; a circa 1965 Andy Warhol lithograph; and a turn-of-the-20th-century, hand-wrought Gorham silver tea set that's valued at $90,000. Also: the Harry S. Truman Building.