The three most important ancient libraries of the world are generally considered to be the Library of Alexandria, the Library of Pergamum, and the Library of Congress.
- The Library of Alexandria, located in Alexandria, Egypt, was one of the largest and most comprehensive libraries of the ancient world. It was founded by Ptolemy I Soter in the 3rd century BC and is believed to have contained over 700,000 scrolls. The library was a major center of learning and scholarship, and it attracted many of the leading intellectuals and scholars of the time.
- The Library of Pergamum, located in the city of Pergamum in modern-day Turkey, was also a major center of learning and scholarship in the ancient world. It was known for its extensive collection of manuscripts on papyrus and was said to be one of the largest and most comprehensive libraries in the ancient world.
- The Library of Congress, located in Washington, D.C., is the national library of the United States and is one of the largest libraries in the world. It was founded in 1800 and is home to a vast collection of books, manuscripts, photographs, maps, and other research materials. It is a major resource for scholars and researchers and is considered one of the most important libraries in the world.