Which countries have gone from more 'niche' travel destinations to mainstream?

I’ve been noticing how many countries seem to go from relatively unknown or niche to very popular in a very short time. An example that comes to mind is Taiwan: 5 years ago I would be really surprised if someone told me they'd go there, but not anymore. It's all over social media and I've heard several people going there this year, for college or just for the food I guess. Have you noticed this too, and for which countries?

P.S. I realize that this might sound a bit selfish or gatekeepy, and it might indeed be. Of course I don't have more rights to go to these countries than others. But I can't deny that the travel experience has changed for me now that everyone is everywhere all the time. The world feels so small. I can fly 10000 km and still feel like I'm in my home country with the number of tourists these days.