I have a confession. One of my bucket lists is to see some of the most amazing libraries in the world. On that list is the Clementinum library. The Clementinum library, was first opened in 1722 as part of the Jesuit university, and houses over 20,000 volumes of mostly foreign theological literature, coming into Clementinum from the beginning of the 17th century until recent times. Books with white painted spines and red marks have been in the library since the time of the Jesuits.
The ceiling frescoes were painted by Jan Hiebl. In 1781, director Karel Rafael Ungar established Biblioteca Nationalis, a collection of Czech language literature. Some of the rare historical books from this collection have been sent to Google for scanning and will eventually be available on Google Books.
and at http://www.thevintagenews.com/2016/07/09/outstanding-the-worlds-most-beautiful-library-is-in-prague-2/