Retrotechtacular: The IBM System/360 Remembered.
In there you'll find a nice short movie with some interesting history.
My brother had started working for Honeywell and he invited me for a sightseeing of his working place.
This was back in 1964, my first ever acquaintance with a computer, in this case a Honeywell 400.

In 1968 I moved to Canada and landed a job with IBM in Vancouver, BC.
The machine used in their data-centre was a 1401.
As a systems analyst/programmer I have since worked on many IBMs and also on several Univac/Unisys mainframes.
Thus my switchover to ThinkPads did not come as a surprise.