Arrangements were made for me to have a tour of the 2nd floor to see where my ancestor, William Frederick Poole would have worked. My tour was given by the archivist who was wonderful, and guided me around and showed me several things, especially things that would have been there between 1856-1869. It was fun putting myself back in that time era. Unfortunately, photography wasn't allowed, but just imagine "a wide array of newspapers and artwork, too, with paintings by Gilbert Stuart and John Singer Sargent and sculptures by Augustus Saint-Gaudens and Houdon." Lots of sitting rooms, 500 newspapers and periodicals, lovely rugs, children's Library, and peace and quiet.
Wikipedia has a lot of information about the Library, pictures, and mention of my ancestor.
My Poole lineage began in Massachusetts in 1632, but my father was born in Evanston, Illinois. And, Evanston was also the death location of William Frederick Poole. Not until I began doing genealogy did I learn of their early Massachusetts roots, and that was a wonderful surprise.