You can't get into Paris's most famous university without a student ID, although you can try to talk your way past a friendly guard. If you succeed, enter on Rue Victor Cousin, cross the cobbled courtyard where students have gathered for nine centuries, and peek into the muraled lecture halls. Today, La Sorbonne remains the heart and soul of the Quartier Latin, though it is also known as Paris IV, one of several campuses that make up the public Université de Paris.
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