If you are staying for several days buy a Carte Orange, zone 1 & 2, to use metro/buses etc rather than the Paris Visite tourist pass which is more expensive.

Tickets can be bought at most metro stations, you will need to ask for the wallet and card from the ticket desk, then attach a passport-sized photo and you have free travel from Monday to Sunday. As this is a weekly pass, aimed at Parisian commuters, be careful with the dates, it runs from Monday to Sunday.

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