If you’re near Pittsburgh the Large Scale Systems Museum is definitely worth a visit. Working PDP11, VAXes, SGI, IBM midrange and mainframe systems can be booted up and used.
The second floor has smaller micros and Macs; not sure if there’s a working NeXT machine or not.
I am also not very far away, and used to find myself driving through Parkesburg sometimes. Had no idea it was there! My first computers were user-friendly TRS-80 Model 1's (school) and my C64, so just missed the 1970's and earlier generations. Will look into a visit in 2026!