Monaco is the second smallest country after Vatican, which makes it possible to visit the country in one day if you are in French Riviera. When I was in Nice, I did not miss the opportunity to do a day trip to Monaco and it was completely worth it.
One of the oldest city in Europe, Marseille is unlike any other city that I have been to in France. The city is vibrant and colourful with an interesting mixture of old and new. From the maze-like Le Panier, to the crowded Vieux Port and the Corniche, and further extended to the Calanques, the different sides of Marseille amazed me.