We visited Paris in the summer and were happy to find that the Paris Pass allowed us to bypass long lines for many places. However, you pay a lot for the pass, and even though there is much you can use it for, there are really too many things you can do. In reality you do not want to go racing around fitting in as many things as humanly possible. So I would recommend it to avoid long lines but not so much as a value for paying for everything individually.
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