The Austrian National Library is worth a visit as are many other historical sites. Strolling through the streets of Vienna, you will realize that the architecture and design of some of these large buildings is just "speechless."
The attention to detail is a joy to see, and found on many buildings. If you also want to explore Vienna heritage then it is highly recommended to hire a travel guide from companies such as https://www.vienna4friends.com/ to avoid any hassle in your travel.
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When you do not look at the great historic buildings of Vienna, you could be relaxing in some of the huge green parklands that house sculptures, statues and palaces.
Unknowingly, you will find yourself suddenly on the Ringstrasse with buildings dating back to the 19th century. This wide avenue embraces all the "old" city of Vienna itself. Other streets have a history dating back to ancient Roman times.
Vienna has many institutions, most notably the Institute for Advanced Studies. The focus is on the study of social sciences.
The House of Music is located in the center of the ancient cities. He recently opened to help people of all backgrounds to discover more about music in a unique way and memorable.
The Natural History Museum and the Museum of Fine Arts are both worthwhile to spend time in; just to help further your understanding of the people of Vienna and its unique and remarkable buildings.
There are many other experiences to discover in Vienna, and in particular you must not forget the Spanish Riding School, the Vienna Philharmonic Orchestra, Vienna Boys Choir and the Theater.