The Library of Congress is the national library of the United States and the largest library in the world. It moved to Washington, DC in 1800, mainly serving Congress and assuming the functions of the National Library of the United States.

The Library of Congress is located on Capitol Hill in Washington. It consists of Jefferson Building, Adams Building and Madison Building, with a total area of 340,000 square meters. It has 30 million books, covering 470 languages and more than 58 million manuscripts. It is the largest collection of rare books in the United States, including the Gutenberg Bible, more than one million American government publications, one million newspapers from all over the world spanning three centuries, and 33,000 copies. In addition, many legal documents, movies, 4.8 million maps and 2.7 million pieces of music have been preserved.