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The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of Congress. It is also the largest library in the world, with more than 162 million items. The collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.
Watch presentations from authors, scholars & artists who come to the Library. Search millions of items in many formats and languages. Explore a growing treasury of digitized materials. Consult with staff online or in one of the research centers to find what you're looking for.
We’re excited to welcome you to the Library of Congress. Free timed-entry tickets are required to enter the Library’s Thomas Jefferson Building. We encourage you to take a moment to review our Know Before You Go page to prepare for a safe and enjoyable visit.
The Prints and Photographs Online Catalog (PPOC) contains catalog records and digital images representing a rich cross-section of still pictures held by the Prints & Photographs Division and, in some cases, other units of the Library of Congress.
Welcome to the Library of Congress. We’ve added new policies to help keep our community safe. Free timed-entry tickets are required for entry. Groups of 21 people or more must request free timed-entry tickets by completing our group registration form. Masks are optional, but use is encouraged.
The starting point for researchers using the Library of Congress, both on-site and remotely via the Web. Links are provided to all research centers and reading rooms, as well as all services available for public researchers and scholars.
Searches for Library of Congress Control Numbers (LCCN), International Standard Book Numbers (ISBN), and International Standard Serial Numbers (ISSN). Numbers must be entered in exact order beginning with the first character.
Research guides to the Library's collections, as well as subject guides prepared by Library of Congress staff, are listed below. More online guides covering other Library of Congress collections are available via the LC Bibliographies, Research Guides and Finding Aids page.
View short tutorials on how to use our many services and research centers. Request a research consultation or orientation. Link directly to all services for researchers available onsite and via the Library's website. Learn about exhibitions, public events, and view maps and floorplans for the Library of Congress.
The Library of Congress has placed online nearly 25,000 Sanborn Fire Insurance Maps, which depict the structure and use of buildings in U.S. cities and towns. Maps will be added monthly until 2020, for a total of approximately 500,000. The online collection now features maps published prior to 1900.