I recommend Japan as a country with many niche museums, here are two I enjoyed: https://www.tdk.com/museum/en/ https://www.tdk.com/museum/en/ https://www.khi.

I recommend Japan as a country with many niche museums, here are two I enjoyed: https://www.tdk.com/museum/en/ https://www.tdk.com/museum/en/ https://www.khi.co.jp/kawasakiworld/english/ https://www.khi.co.jp/kawasakiworld/english/ They are museums run by companies about their own histories and industries. The TDK one was quite unexpected: it's basically a museum about very thin plastic.