Library of Congress

The Library of Congress is today the largest library in the world. But it had more humble beginnings, being founded in 1800 to house early documents of the United States that were transferred from Philadelphia to Washington, D.C. For the first 100 years, it was mainly a reference library for Congress, but today is home to 158 million items that include 36 million books in 460 languages and 69 million manuscripts. It has the largest collection of rare books in North America. The library is open to the public, but potential users are asked to check the library’s list of holdings on online before they come to make research materials more easily findable when they arrive. The main reading room is known as the Sacred Room, and is absolutely stunning.