Staged to celebrate the completion of the Panama Canal, and drawing over 19 million visitors in only nine months, the Pan-Pacific International Expo rose like a literal jewel from the ashes of San Francisco's 1906 Earthquake and Fire.
A Century of Progress International Exposition was held in Chicago, Illinois from 1933 to 1934 to celebrate the city's centennial. The theme of the fair was technological innovation. Its motto was "Science Finds, Industry Applies, Man Conforms".
The 1939-40 New York World's Fair, located on the current site of Flushing Meadows-Corona Park, was one of the largest world's fairs of all time. The fair ran for two seasons and over 44 million people attended.
The Golden Gate International Exposition was held in San Francisco, California to celebrate the opening of the San Francisco-Oakland Bay Bridge and the Golden Gate Bridge. The exposition's first season ran from February 18, 1939 through October 29, 1939 and its second season was from May 25, 1940 through September 29, 1940.
The 1964/1965 New York World’s Fair, located on the current site of Flushing Meadows-Corona Park. The fair ran for two seasons and took place without sanctioning from the Bureau of International Expositions.
Expo 67 was held in Montreal, Quebec, Canada from April 27 to October 29, 1967. It was considered to be the most successful World's Fair of the 20th century, with over 50 million visitors and 62 nations participating.
True. The kids were being recruited after the latest firing went astray. The guy in the background is trying to see where Bang Gunley landed. I believe it was in the Pool of Industry, though some insist he was skewered on the Coca Cola carillon.
Quaker Oats featured their "puffed wheat" gun, mounted on a truck bed near the family telephone booth. The human cannonball must be eating lunch somewhere, before the next show starts.
Send in the clowns.
I believe this ride was part of Funland. In a rush to get the shot, I caused some camera motion.
Following are maps of three entertainment venues I didn't photograph.
Regarding art, you must have meant the Art Institute.
The Field Museum is a natural history museum originally established to purchase and preserve artifacts from the World's Columbian Exposition. It is on the museum campus, which is walkable from Willis Tower, although if you do walk rather than taking a taxi, it won't leave a much time for exploring the museum. Also on the museum campus are the Shedd Aquarium and the Adler Planetarium. If you go by taxi, you could explore any one of these in the time you have available.
Jackson park is too far to walk and would take you through some questionable neighborhoods beside; you would have to take a taxi. The Museum of Science and Industry, formerly the Fine Arts building of the Columbian Exposition, is impressive on the outside as one of the finest examples of neoclassic architecture. Like the other major museums, you would only be able to get a brief flavor of the exhibits in the time you have.
Another activity I would recommend, although not directly connected to the fairs, is to take an architectural river cruise. Look for one associated with the Chicago Architectural Foundation: https://www.architecture.org/experience-caf/tours/detail/chicago-architecture-foundation-river-cruise-aboard-chicagos-first-lady-cruises/
Here's a link to photos of "One Fine Day in Downtown Chicago" (August 2010)
I first sat on the Parthenon steps in 1953 and looked out at the lovely maidens supporting a roof of the Erechtheum nearby. In 2011 the Parthenon wasn't so charming because of much scaffolding and other equipment used for restoring. But the maidens were still as appealing!
The nearby structures appear to be the Theater of Herodes Atticus and the lengthy Stoa of Eumenes.
Parthenon and Stoa.