This Hidden Library in Prague is the best I Have Ever Seen.

I visited Prague this summer ( Thank you FlyDubai 6 hr flight!) and found myself roaming around Strahov Monastery only to see that it has a very old library. I bought my ticket and went in. My jaw dropped. They don't allow you to actually go inside, probably in an attempt to preserve the very very old books, but trust me it's worth it. 

 Strahov Library, Prague

Strahov Library, Prague