I think this might be the most beautiful building I have ever been to! Built of solid marble and with stunning ceilings and architectural details everywhere. I found it so moving that so much care was taken over a building dedicated to books and learning. There is a wonderful FREE Treasures exhibition which displays some of the library's collection - not only books but also historical papers, Virginia Woolf's walking stick, fragments of Shelley's skull (!), Charles Dickens' letter opener with the handle made from his cat's paw (!!)... All so fascinating. I would highly recommend signing up for one of the FREE guided tours. Tickets are released on a Sunday for the coming week and they do get booked up so reserve a place online for some additional information about the history and architecture AND most importantly, for access to the astonishing reading room, which is otherwise only open to readers. Our guide, Dempsey, told us she had been doing tours for 20 years and her passion and love for the building shone through and really helped to enhance an already wonderful visit. One of the highlights of my time in New York.