If you're interested in science, check out the Musée Curie and see where the famous husband-and-wife team made major advancements in chemistry, notably with the discovery of radium. The laboratory is preserved and offers a peak into the science of almost a century ago. Worth a quick detour if you're in the area.
There is no entrance fee, but donations to the Curie Institute are welcome.
Open Tuesday-Friday, 10am-6pm
Musée Curie
11 rue Pierre et Marie Curie, 5th
01 42 34 67 50
Métro : Place Monge or Cardinal Lemoine
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