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I don’t know about museums near you, but most museums I’ve been to internationally are free to enter and to see most of their exhibits. They’ll often have much more in their collections than what’s on display, but they’re absolutely still a public good.

We also have a responsibility to preserve stuff from the past for future generations. As our ancestors have done for us.

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Interesting idea of free museums. I can't think of one museum I've ever been to that did not require purchasing a ticket. Granted, in my limited travels abroad, it has been for work with no time for that kind of thing, so my experience is solely with museums in the US.
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Many museums in the UK are nominally free (although they encourage a donation) and they charge for special exhibitions. A few in France are free. Can't speak to more broadly. (And, yes, free museums are pretty uncommon in the US although they exist--especially at universities, most of the Smithsonian Museums, and so forth.) Fairly broad experience even if it's often been in conjunction with work travel.
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