For over two centuries, the Library of Congress (LOC) and its staff have served as invaluable resources for American legislators. But their mission isn’t limited to U.S. politics. With a diverse inventory that includes iconic films, historical documents, and your tweets about lunch, the LOC is a cultural treasure. Here are 11 facts worth knowing about the Washington D.C.-based establishment.

1. IT’S THE NATION'S OLDEST CULTURAL INSTITUTION.

Founded in 1800, the Library of Congress is America’s oldest federal cultural institution. It was established by the same bill that officially moved the capital from Philadelphia to Washington D.C. The library was conceived of as a resource available exclusively to members of Congress, containing "such books as may be necessary for the use of Congress." That remains the case today, though citizens can read books on site or request them at their local library through an interlibrary loan.

2. THOMAS JEFFERSON HELPED REBUILD THE COLLECTION AFTER A FIRE.

Not long after it was established, tragedy struck the Library of Congress: Its contents were destroyed when the Capitol Building was set on fire by British Troops during the War of 1812. Approximately 3000 books (mostly law-related) were lost in the blaze, but luckily a friend of Washington D.C. owned a collection that was even bigger. Thomas Jefferson’s personal library comprised well over 6000 volumes, making it the largest library in the country at the time. He agreed to sell all of his books to Congress for $23,950 in 1815. Jefferson's contributions significantly expanded the scope of the library, by including books on art, science, and philosophy. (The increased diversity of the collection was a subject of criticism at the time, to which Jefferson responded by saying "there is in fact no subject to which a member of Congress may not have occasion to refer.”) Sadly, the library met with another tragedy when a second fire tore through it on Christmas Eve 1851, burning two-thirds of Jefferson’s contribution.

3. JAMES MADISON FIRST PROPOSED THE IDEA.

Seventeen years prior to the LOC's official formation, James Madison proposed the idea of a special library for Congress. He planted the idea as a Continental Congress member in 1783 when he suggested compiling a list of books to which lawmakers could refer. As president, Madison approved the purchase of Jefferson’s personal library in 1814.

4. IT MAKES CONGRESS'S JOB A LOT EASIER.

Congress members drafting legislation don’t necessarily need to do the nitty-gritty research themselves: There’s a whole team [PDF] of lawyers, librarians, economists, and scientists employed through the Library of Congress to do it for them. Established in 1914, the Congressional Research Service (CRS) is a legislative department within the LOC responsible for supporting lawmakers through every step of the lawmaking process. Based on what’s asked of them, CRS employees supply House and Senate members with reports, briefings, seminars, presentations, or consultations detailing research on the issue in question. The CRS is currently staffed with 600 analysts. In any given year, a single researcher responds to hundreds of congressional requests.

5. IT’S THE LARGEST LIBRARY ON EARTH.

With over 164 million items in its inventory, the LOC is the world’s largest library. In addition to the 38 million books and other printed materials on the premises, the institution contains millions of photographs, recordings, and films. It also houses some record-breaking collections; more maps, comics, newspapers, and phonebooks can each be found there than any other place on Earth. The whole thing is stored on about 838 miles of bookshelves.

6. IT CONTAINS SOME SURPRISING ITEMS.

The Library of Congress is home to an eclectic collection, with books ranging in size from a tiny copy of “Ole King Cole” to a five-by-seven-foot photo book filled with color images of Bhutan. Some items, like a Gutenberg Bible and a rough draft of the Declaration of Independence, feel right at home in the historic library. Others, like Rosa Parks’s peanut butter pancakes recipe, are a bit more unexpected. Additional noteworthy artifacts include Bob Hope’s joke collection, George Gershwin’s piano, and the contents of Abraham Lincoln's pockets the night he was shot.

7. THE LIBRARY OWNS MATERIALS FROM AROUND THE WORLD.

The Library of Congress isn’t solely dedicated to American documents. The institution possesses materials acquired from all around the globe, including 3 million items from Asia and 10 million items in the Iberian, Latin American, and Caribbean collections. Over half the books in their inventory are written in a language other than English. In total, over 460 languages are represented, and their end goal is to eventually have at least one item from every nation. The LOC also maintains overseas offices in New Delhi, Cairo, Islamabad, Jakarta, Nairobi, and Rio to acquire, catalog, and preserve items that might be hard to access otherwise.

8. IT PRESERVES AMERICA’S MOST IMPORTANT FILMS.

Since the National Film Preservation Act was passed in 1988, 700 "culturally, historically, or aesthetically" significant films have been selected for the LOC archives. Up to 25 entries are chosen each year by a board of industry professionals, and the only rule is that submissions must be at least 10 years old. Beyond that, they can be anything from beloved comedy blockbusters like Ghostbusters (1984) to health class classics like The Story of Menstruation (1946). Pieces added to the National Film Registry are kept in a climate-controlled storage space where they can theoretically last for centuries.

9. IT SERVES PATRONS OF ALL ABILITIES.

In 1931 the Library of Congress launched The National Library Service for the Blind and Physically Handicapped (NLS). Today the service offers free braille and audio books, either through digital downloads or physical deliveries, to people with visual impairments or other issues that limit their reading abilities. Offerings include a wide array of books and magazines, as well as the world’s largest collection of braille music. NLS librarians are currently undertaking the painstaking process of scanning every sheet of braille music onto their computer system. Once that project is complete, the National Library Service’s entire collection will be fully digitized.

10. ONLY THREE LIBRARIANS OF CONGRESS HAVE BEEN ACTUAL LIBRARIANS.

When nominating someone to head the largest library in the world, presidents rarely choose actual librarians. They’re more likely to select a scholar, historian, or some other veteran of academia for the job. Of the 14 Librarians of Congress we’ve had, current title-holder Carla Hayden is one of just three to come into the role with prior librarian experience. (She is also the first woman and the first African American to hold the job.) On top of running the world’s largest library, Hayden is also responsible for managing relations with Congress, selecting the Poet Laureate, and overseeing the U.S. Copyright Office.

11. IT RECEIVES EVERY PUBLIC TWEET YOU WRITE.

The government isn’t just responsible for cataloging tweets coming out of the White House. In 2010, Twitter agreed to donate every public tweet in its archive to the Library of Congress. That amounts to several hundred million tweets a day. In addition to documenting the rise and fall of #dressgate and live tweets of The Walking Dead, the archive would also act as an invaluable data source for tracking language and societal trends. Unfortunately, that archive isn’t much closer to being completed than the day the deal was announced. The LOC has yet to develop a way to organize the information, and for the past seven years, unprocessed tweets have been stored out-of-sight on a server. There’s still no word on what the next step will be, but that might change with the newest Librarian of Congress. Unlike her predecessor, Carla Hayden is known for taking a digital-forward approach to librarianship.