Well ancient and pristinely preserved do not really usually go together... but Villa Papyri, near Pompeii, almost gets you there. The villa's name derives from the discovery of its library, the only surviving library from the Graeco-Roman world that exists in its entirety. It contains over 1,800 papyrus scrolls. The scrolls are coarbonized and rolled up, but each scroll gets very slowly unrolled, read, studied and preserved in the National Library in Naples. With the use of new technologies the analysis of the scrolls is becoming faster and allowing the recover more and more of the works. It’s possible to go visit both the ruins of the villa and the scrolls. https://en.wikipedia.org/wiki/Villa_of_the_Papyri