I bought the 2-day museum pass so I had to visit a certain number of museums each day. My husband and I walked passed by this little place while walking along the seine river. The entrance of the museum is really weird. A ticket booth with stairs leading visitors down the stairs into the underground.
The museum shows you how fresh and waste water are managed throughout the city. At the latter leg of the touring, the sewer smell was getting pretty strong tho. I'd suggest you bring a towel or napkin so you can cover your nose should the smell gets too strong; however, this experience was so educational and surprisingly fun. I mean, who gets to visit a sewer system underground nowadays? And it's a historic city Paris we are speaking of.
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