This month marks the centennial of the death of Harriet Tubman, the legendary abolitionist who helped slaves escape to freedom. We examine her incredible life with one of the nation's leading Tubman biographers, Kate Clifford Larson, author of Bound for the Promised Land: Harriet Tubman, Portrait of an American Hero, and consulting historian and curator of the Harriet Tubman Underground Railroad State Park and Visitor Center; and Anthony Cohen, who conducts tours along the routes of the Underground Railroad.