Fontainebleau

Second only to Versailles, the medieval Palace of Fontainebleau is another great destination just outside of the city.
Former home to Napoleon III and Louis VII, the Palace was known as Second Rome due to its design and decor. After visiting the palace, take a peaceful stroll through the vast nearby forest.
If you want to visit for free, go on the first Sunday of the month.
How to get to Fontainebleau
Take a 40 minute ride aboard the Transilien train from Gare de Lyon to Fontainebleau-Avon station. From there, you can either take a 15 minute bus ride or stroll the 3km to get to the forest.