Modern Mechanix has an old National Geographic from 1965 with a huge spread on the World's Fair in New York. Step back to the atomic era and see the now-endangered Tent of Tomorrow in its glory days. Not many of these structures and rides exist today, at least not in New York; the giant tire is alive and well in Detroit, and of course, the Walt Disney-created ride, "It's a Small World" is still going -- check out some video of it here.