When World's Fairs close, many U.S. Pavilions survive.

After Expo 58, Brussels used some of the pavilion for a color television studio (known as Studio 58).

The Pacific Science Center, the former U.S. Science Pavilion, for The Seattle World's Fair continues it's mission of science education for over 60 years.

The Biosphere in Montreal uses the framework of the geodesic dome for Biosphere, another science educational facility on the former grounds of Expo 67.

Knoville and New York removed the pavilions for development using the land for other buildings after keeping the building intact once the fair was over.

The U.S Pavillion for Expo 74, was repurposed in a few options in 50 years until converted to an event center.

When the fair was over, the Boeing Amphitheater was to remain for outdoor events (shown in the Expo 74 movie) but deteriorated over time.

After the fair, the IMAX theater was replaced with a smaller version that was in use until a nearby multiplex theater added one.

The kiddie rides were removed (along with the theater) to repurpose it as an outdoor amphitheater.

The canvas (on the outside of the $11 million dollar (1974 US dollars) pavilion) didn't survived the elements of the weather and was removed in 1979 keeping the steel cable frame intact.

Since then, LED lighting has been added to enhance the pavilion at night.

Many of these renovations happened before the 50th Anniversay of Expo 74 and show the basic framework of the building that remains.