If anyone is interested in telephone exchange technology at all, I highly recommend checking out the Connections Museum in Seattle. They have multiple eras of electromechanical switching equipment up and running, and a huge collection of cool old phones, teletypes and payphones. They also have a great YouTube channel with very knowledgeable people.

https://www.telcomhistory.org/ConnectionsSeattle.html

https://m.youtube.com/@ConnectionsMuseum

I feel like they're not well known and there's no place like it!