Library of Congress
The Library of Congress is the nation's oldest federal cultural institution. The Library preserves a collection of more than 119 million items, more than two-thirds of which are in media other than books. These include the largest map, film and television collections in the world. In addition to its primary mission of serving the research needs of the U.S. Congress, the Library serves all Americans through its popular Web site and in its 22 reading rooms on Capitol Hill.