When in Quartier Atlantis and the surrounding area, you'll want to check out sights like Le Grand Dôme or Espace Jean Monnet and hop on the metro to see more the city at Massy-Europe Tram Stop or Massy-Palaiseau RER Station.
Quartier Massy-Opéra I might not have many top sights, but Espace Jean Monnet and Le Grand Dôme are two attractions nearby that you can check out.
Even though there aren't top sights in Quartier Centre Ville, you can explore the larger area and take in top sights like Antony Market. Jump on the metro at Massy-Europe Tram Stop to see more of the city.