The Library of Congress (LIBRARY OF CONGRESS) http://www.loc.gov/There is an aisle directly to the National Library in the Capitol Building. Note the signs and do not need to go out. Opening hours - "Monday to Saturday 8:30 - 4:30 ticket-free National Library is composed of Jefferson Building, Adams Building and Madison Building, of which Thomas Jefferson Building is open to the public. We went to the other two buildings earlier and also had the name of the National Library, but it was not open to the public. The U.S. Capital-to-Washington Act of 1800 provided for the establishment of a library to provide Congress with the required books. At that time, only 740 books and three maps were collected. Retired President Jefferson provided private collections to Congress. Later, in 1897, the newly built Library of Congress opened and became the library palace of the American people. It was named Thomas Jefferson Building in 1980 to commemorate his contribution to the Library of Congress. Walking into the National Library, the vast marble corridor, stained glass, exquisite handrails, symbolizing civilization, the universe, science, nature and other sculptures, murals, sculptures and mosaics are everywhere, just like visiting the magnificent art museum. The treasures of the town hall are the giant handwritten "Mainz Bible" and the printed "Gutenberg Bible" in the mid-15th century. The second floor overlooks the main reading room. The National Library of the United States now has 150 million collections, the largest collection of rare books in the United States. Libraries use their collections to serve Congress, as well as other government departments, research institutions, scholars and general readers. In addition to the main reading room, there are 21 special reading rooms. The National Library has a showroom with detailed information on the 1964 Civil Rights Act of Congress (CIVIL RIGHT ACT OF 1964), which is of great significance in American history. According to the materials, in the 1990s, the National Library launched the digital project of American Past Library, which provides multimedia, photographs, audio, video and American text materials for young people and the nation. It took us an hour to walk around.