Google Map of Paris
The legend is located below the map. You can also click on the icons on the map for a description. I've included some additional sites I believe would be of interest, including the location of the statue of D'Artagan and Dumas. Please let me know if you have some suggestions for additional spots on the map. You can check out Musketeer spottings outside of Paris here.
View Three Musketeers in Paris in a larger map