Oleg K.
Google
This is an outstanding history museum with a great entertainment and educational value. Definitely take advantage of the excellent audio guide. The museum is laid out chronologically in the setting of an archeological location of a roman port. It guides through the history of Marseille from prehistory through today.
The physical displays are supported by really good multimedia content, which allows you to deep dive on specific topics. The displays are relevant, interesting, clearly marked (French only unfortunately).
The highlight was the audio guide. It covered the thematic areas giving the overview and noting the key artifacts. It was sufficiently in-depth giving great explanations of each period, the historical context of the artifacts, and supporting stories. Very rich content presented in an accessible but not dumbed-down manner. Great job, museum!
Overall, it is definitely among the best city history museums. Highly recommend.
Note, if visiting on the day the mall is closed, go through the gatehouse on the archeological side. The signs are misleading.