The Library Of Congress
This is the largest library in the world! It serves as the main research facility for members of the U.S. Congress and also houses the U.S. Copyright Office. The Library was officially founded in 1800, but the original site (and its collections) were burned and destroyed by British troops. Construction of the current building was completed in 1897, at a cost of $6.5 million. Today, the Library is home to 838 miles of bookshelves, which house over 164 million items! The official Library of Congress website says that 12,000 new items are added to the collections each day.