Visit Collège de France, a well-respected institution in the local area. Watch on as the energetic scholars hurry between their classes.
This modern university is free to enter, so you can have a fun day out without reaching for your wallet. However, Collège de France isn't the only place to visit in or around the busy neighborhood of Sorbonne. With Eiffel Tower, Louvre Museum and Arc de Triomphe not far away, you may want to stay a while longer.