I will be in Paris from a Monday through a Saturday. Other than a day trip to Versailles, I plan on spending the rest of the time touring the city. I will be arriving at CDG airport and staying in 7E near Invalides. Someone suggested that I buy an Orange(?) pass that would get me from CDG to Invalides, allow me to travel around Paris for the week, allow me to get to Versailles, and then get me from Versailles back to CDG on Saturday. Does anyone have any info on this pass and where I can buy/obtain info etc.. Thanks for your help.