This structure was built by Joseph Emanuel Fischer von Erlach between 1723 and 1735, according to a design by his father Johann Bernhard Fischer von Erlach. Both names represent the highest quality in architecture and the Grand Hall of the National Library is said to be the most beautiful library room in the world. Don't miss visiting Grand Hall, with frescos by Daniel Gran and the historical Reading Room with frescos by Johann Bergl. The National Library's Museum of Globes is also open to the public. To imagine what imperial entertainment such as dances or masquerades were like, take a look into the ballrooms. Such imperial splendor be should enjoyed in a calm and relaxed mood.