Folger Shakespeare Library

The Folger Shakespeare Library describes itself as "the world’s largest Shakespeare collection, the ultimate resource for exploring Shakespeare and his world," which "provide[s] unparalleled access to a huge array of resources, from original sources to modern interpretations."

Folgerpedia is a good resource for researching items relating to Shakespeare.

Based on Capitol Hill in Washington, D.C., this library was founded and funded by Henry Clay Folger and his wife Emily.