As long as you have learned English, you must know the Library of Congress. The copyright page of the original book in the United States has a serial number of the Library of Congress. They manage the publications quite standardized and scientific. When you come to the scene, you can fully feel the atmosphere of knowledge. Knowledge should be respected here. Although visitors cannot walk in the library completely, many murals and zenith paintings can be enjoyed. Interested can also continue to see the special exhibition inside.