World's Fairs or International Expositions are large-scale exhibitions that highlight technology, agriculture and other innovations of national or cultural significance. These fairs are open to the general public and can run for three weeks to six months.

The Century of Progress International Exposition was held along Lake Michigan and Northerly Island Park in Chicago, Illinois, from May 27, 1933, to October 31, 1934. The theme was "Science Finds, Industry Applies, Man Conforms." The fair had more than 48 million visitors. A notable structure was the Sky Ride, and one of the highlights was the flight of the Graf Zeppelin airship.

The New York World's Fair took place in Flushing Meadows, Queens from April 30, 1939 to October 31, 1940. Nearly 45 million people visited the New York World's Fair. The theme was "The World of Tomorrow." Notable structures of this fair was the 18-story Perisphere and the 700-foot Trylon obelisk.

The 1964 New York World's Fair was held in Flushing Meadows, New York from April 22, 1964 to October 18, 1964, and then again from April 25, 1965 to October 17, 1965. The theme was "Peace Through understanding." The fair had more than 50 million visitors. The fair is remembered as emphasizing technology and space exploration and has often been described as "Space Age." Highlights of the fair was a twelve story, stainless-steel globe called the Unisphere, the New York State Pavillion which still remains today, the General Motors "Futurama II' exhibit showing superhighways and ultramodern architecture, RCA's color television and Ford's Mustang.