On the first Sunday of every month, most French museums are free (but check with them beforehand, just in case). Some on this list ask for just a small fee for entrance and you’ll need to book a visit in advance.
France’s national anthem was created in Marseille, by a soldier wishing to write a little ditty that might stir French nationalism. There’s a little museum that is dedicated to it in Marseille, which you can only visit if you email them beforehand. It has French artefacts and a film to watch.
Opening hours: Tuesdays and Fridays, 10am to 3pm.
23-25 rue Thubaneau, Marseille, France, +33 4 91 55 36 00