Clementinum is the second biggest complex of buildings after Prague castle. This former Jesuit college hosts one of the most beautiful libraries in the world with 20 000 old books, beautiful fresco paintings and a few historically rare globes.
Book a guided tour of the complex to see it with your own eyes and climb to the top of the Astronomical Tower for a breathtaking view of the Old Town. It is one of the best in town and the library itself is one of a kind.
The tours are available in English and the cost of a full ticket is 300 CZK.