Very interesting museum covering the history of measurements, clocks, mechanical machinery, clocks, nautical science, etc.. Highly recommend getting the audio guide (available in French, English, Spanish, Chinese, German, Japanese, and Italian). Museum is on three floors - accessible via lift or stairs. There's also a cafe on site with some light foodfare options. The displays are interesting and the ending portion inside the former church which now houses some vehicles, has a swing pendulum which is great to see. Very small giftshop - mostly books - at the end of the tour. An informative visit.