I would love to visit a museum where I could experience old development software/hardware from Japan.

Check out this great article about the seemingly endless creativity at SEGA during the 80s/90s:

http://shmuplations.com/segahistory/

It would be so cool to have the original source code to those games available as well - let the kids (and adults:) at the museum edit/draw their own sprites, make modifications (jumping higher, etc) and let them collaboratively compile & run on original arcade cabinets..

One can dream :)