Michael wrote

Great--no question about that. I used to complain about the closed stacks, but having tramped around Firestone library in Princeton yesterday balancing a huge stack of books on my winter coat, hunting for books not in their proper place, I have come to appreciate even the convenient delivery of LC books straight to the European reading room. Is it the "greatest"? One could make a strong claim in terms of the collection and environment. But the great cafe in the Staastsbibliothek in Berlin, which is a modern architectural masterpiece (see the film "Himmel ueber Berlin") certainly prompt the observation that all the great libraries have some pluses and minuses.