From Orly International Airport:
Take the A6-E15.
Take the exit to Porte d'Orleans.
Turn right and follow Rue Professeur Hyacinthe Vincent, which becomes Rue Émile Faguet and then Rue De La Tombe-Issoire.
Turn left at Avenue René Coty.
Continue through Place Denfert Rochereau to Ave Denfert Rochereau.
Turn left on Avenue de l'Observatoire.
Make an immediate left onto Boulevard de Montparnasse.