Opéra > Musée d'Orsay = When you are at Opéra métro station, take the line 8 (towards "Porte Balard") Then transfer at "Madeleine" station to line 12 (towards "Mairie d'Issy") and stop at "Solférino" (about 12 minutes)
Musée d'Orsay > Opéra On the way back, from "Solférino" take the line 12 (towards "Aubervilliers/Front populaire")
Then transfer to "Madeleine" station to line 8 (towards "Créteil/Pointe du lac") and stop at "Opéra"
from "Bastille" to "Pigalle" = either the way you said = Take the line 4 (towards "Balard") Then stop at " Strasbourg Saint-Denis" and transfer to line 4 (towards "Porte de Clignancourt") Then stop at "Barbes Rochechouart" station to line 2 towards "Porte Dauphine" Arrive at "Pigalle" station All together , with Bastille and Pigalle, 2 transfers and 11 stations.
OR
Take the line 5 (towards Bobigny/Pablo Picasso) Then transfer at "Gare de l'Est" station to line 4 (towards "Porte de Clignancourt" ) Then transfer at "Barbes Rochechouart" to line 2 (towards "Porte Dauphine") Arrive at " Pigalle" . (about 25 minutes and if you count Bastille and Pigalle , Pigalle will be the thirteenth métro station .
