The view from the 56th floor of the Montparnasse tower is always stunning, rain or shine. From here you can see the same monuments as from the Eiffel Tower, like the Arc de Triomphe, the Louvre, Notre Dame, Sacré-Coeur, and the Grand Palais. There's just one difference: when you're not standing on the Eiffel Tower, you can actually see it! So if you want to snap a photo of yourself with the famous tower in the background, then the Montparnasse tower is the place to go.
Why else choose the Montparnasse Tower? It's a decidedly more relaxed experience than visiting the Eiffel, which is always swarmed with tourists. The plentiful interactive kiosks are a great way to learn the history of the tower and the city beyond. And thanks to the 360 Café, located on the 56th floor, you can have a relaxing snack or beverage while you take in the view.