Folger Shakespeare Library
"The Folger Shakespeare Library has the world's largest collection of materials relating to Shakespeare and his works, from the 16th century to the present day, as well as a world-renowned collection of books, manuscripts, and prints from Renaissance Europe....
The Folger collection is vast and varied, including: about 260,000 printed books; 60,000 manuscripts; 90,000 prints, drawings, photographs, paintings, and other works of art; and a wealth of performance history, from a quarter of a million playbills to films, recordings, and stage costumes."