Seven documentaries by Ken Burns offer an anthem to the nation and its people. "Brooklyn Bridge" and "Statue of Liberty" recalls the building of two New York edifices. "Empire of the Air" recounts the creators of radio, while "The Congress" depicts a unique American institution. Artist "Thomas Hart Benton" and politician "Huey Long" emerge in compelling biographies, while "The Shakers" is a moving tribute to an enduring religious experiment.