Built atop the Montparnasse – Bienvenüe Paris Métro station, the Tour Montparnasse is built in the style known as 'Eyesore'. However, there are plenty of reasons to visit. There's a restaurant called le Ciel de Paris, on the 56th floor, a terrace on the top floor, and Europe's fastest elevator. On a clear day you can see for 40 km or more.
Up above the hustle and bustle of the French capital is quite literally rarefied air. Breathe it in with a visit to Tour Montparnasse.
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I suggest you chose one of either go up the Eiffel, Arc de Triomphe or Tour Montparnasse.
But among the three, you'll have more space and a full 360 degree view with Montparnasse