This pass gives you free entry to over 55 museums and monuments in and around Paris.
Paris is blessed with what seems like a museum for almost every subject: fashion, money, music, cinema and even the city's century-old sewage system.
On top of getting free entry to these sights, you may get to jump the queues, which is a real bonus in the busy summer months.
If you do contemplate buying a Paris Museum Pass, bear in mind that it works only for a limited number of the total number of museums in Paris, and even then may not be good for special exhibitions – for which an extra fee usually applies. You may also find that the Pass relates only to visits on weekdays, not at weekends. So, it is worth doing a bit of pre-planning, to figure out where you want to go, and to remember that sometimes it’s less expensive just to buy individual museum tickets online in advance to skip the lines.
And, on the subject of jumping the queues, which are really only a problem at the Louvre, the Musée d'Orsay, Versailles, the Orangerie and occasionally the Centre Pompidou take account of the fact that Museum Pass will not allow you to queue jump at the Eiffel Tower, Notre Dame’s towers, the Catacombs, Sainte-Chapelle or Versailles.
You've just got to do some mental arithmetic, and decide whether it's worth it for the duration of your stay.