Lello & Irmao in Porto, Portugal usually makes the various lists of The Top 10 Most Beautiful Bookstores in the World. It opened in 1906 and features stunning Art Deco woodwork, a stained glass ceiling, and ornate shelving with a dramatic staircase up the center of the store.
Yes. Just yes. Make the books older with wood covers and papyrus paper and the library itself underground and rougher (with several more floors), and you have The Library in Ayla, home to every single shred of knowledge in Ayla and run by Animals.