The Computer Museum of America in Georgia is amazing! They had all sorts of old computers running and on display, including some Cray supercomputers. Recommend a visit if you're ever in the area.

https://www.computermuseumofamerica.org/

Is it ever going to reopen? I'd like to visit in person someday.

Though it looks like you can log in remotely - and not just to emulators but to real hardware systems as well.