This is effectively a museum pass which you can buy to cover 1, 3 or 5 days. It will get you into almost every Paris attraction you may want to see from the Louvre to Notre Dame, with the possible exclusion of the Eiffel Tower, it starts at 15euros for 1 day and gets progressively cheaper for longer periods The best bit isn't the museums it gets you into though, it's the fact that for places like the Louvre and the Orsay because you don't have to queue to get tickets you can skip large sections of the queuing process and just get straight to the interesting bits. It also encourages you to try the smaller museums you wouldn't have done before as you don't have to pay more to go in. They can be bought at any metro station or any museum or even at the eurostar terminal.

www.paris.org/Musees/mmc.html any metro station

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