On Sunday I went to Musée de la Poste in Paris and they currently have a temporary exhibit on postcards from holidays. The cards were of all different ages and grouped into sections.
They had some amazing cards, like these ones with bonus photos in:
The museum wasn’t busy at all. While I don’t expect everyone to learn and present everything in English, the entire museum was in French with minimal sections accompanied by the English audio guide. I think to attract more people, a wider range of languages on the displays would have been nice, hence, I would not recommend this museum unless you are near fluent in French.
They had some lovely cards on their gift shop, including FR-1650034 off to Taiwan!