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This is the backside of the main building of the university of Vienna. The sculptures depict EMPEDOCLES (first pic) and Pythagoras (second pic). For more information on other statues on the building and inside (go inside and explore the Arkadenhof, it is public and beautiful!) see
https://statues.vanderkrogt.net/object.php?webpage=ST&record=atwi152
or the Wikipedia page of the University, which explains all the statues on the inside (they depict scientists etc., wikipedia in german)
https://de.wikipedia.org/wiki/Hauptgeb%C3%A4ude_der_Universit%C3%A4t_Wien