This reminds me of Polish National Library web site. They did the same thing some years ago. They went into great effort to scan and publish digitally huge amount of books, publications, postcards, images, etc. Some books are centuries old. A lot of Polish content but not only. Have to admit, looking at old prints is a magical experience to me.

https://polona.pl/ (change language on the bottom)

Edit: I can see now, both, Smithsonian and National Library of Poland are part of the IIIF Consortium.