nypl’s main branch but ironically there aren’t really books for you to check out these days lol. a particular highlight is the reading room (pictured). there’s also a small (but very cool) museum exhibit that has stuff like the original winnie the pooh characters, lots of historical political pamphlets, some art, old religious / botanical / astronomical texts, first edition of a vindication of the rights of women, and more.
if you want to actually check out books, there’s another library building across the street lol, it is modern and kinda cool but not as beautiful