Karolinium Entrance, Prague, CZ, 2008

The Karolinium is the oldest complex of buildings in the possession of Universita Karlova (Charles University). I've been unable to get a date of construction, but one website says that one window dates to 1370, and the complex was at least conceived in the late 1360's, after Charles College required dedicated facilities. During its long history, the Karolinium has hosted most of the universities more famous professors and students, including Jan Hus. Today the Karolinium hosts many activities, including graduations.