Are there still World's Fairs?
I just learned about the 1909 held in Seattle.
The site of the fair is now the University of Washington campus.
Funny side note...apparently each World's Fair ticket had a number printed on it. Every guest of the fair received a gift that corresponded with the number on their ticket. It was kind of like a raffle. They gifted all sorts of things from post cards to loaves of bread.
One year they tried giving away a baby.