Library of Congress
The library of congress. the library of congress is the nation's oldest federal cultural institution, and it serves as the research arm of congress. it is also the largest library in the world, with more than 120 million items. the collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.
http://www.loc.gov/
Library of Congress Exhibits
The library of congress offers a wide range on online exhibitions featuring treasures from its own collections as well as the treasures of other national libraries worldwide.
http://www.loc.gov/exhibits/