My family went to the 1964 NY World's Fair several times. I was about 8 years old at the time, yet I vividly remember several of the exhibits. The Ford exhibit was cool as you rode in a convertible car to see the displays. But my favorite was the GM exhibit. I recently found this promotional video describing the GM exhibit at the 1964 NY Worlds Fair.
The visitors rode in seats on a conveyor belt that travelled through a series of large-scale miniature dioramas. The scene I remember being most impressed by was the laser logging operation. It was so cool to see it again in this video, much like I remembered it. I think this exhibit, and the dioramas at the NY Museum of Natural History, were largely responsible for my interest in miniature dioramas. My interest in trains came much later.