United States Library of Congress is the world's largest library collections of the Capitol in Washington Zhengdong Department, by the Jefferson Building, Adams Memorial Building and Madison Building, constitute. It first established in 1800, a collection of 20 million books and a variety of charts, manuscripts, maps, periodicals, records, movies, film, etc., the total reached 80 million. Library shelves connect up to 547 kilometers. Here are Washington's diaries, manuscripts, "the Declaration of Independence," manuscript, first printed the book "the Bible", and even books donated by the Qing government. This is a huge knowledge of the visitors come here, even if it is too late to sit down and read books, at least visit and check it out large scale and very standard layout.