The view towards the Jardin du Luxembourg in the 6th arrondissement from Montparnasse Tower in the 15th. While the Montparnasse Tower may divide public opinion, as the tallest building in Paris outside of the La Defence business district, its observation deck on the 56th floor, 200 metres high, provides one of the best views of Paris. The view covers a radius of 40km, and on a clear day you can even see aircraft taking off from Orly Airport (Paris' second airport).