This is one of MGM's "Traveltalks" with James A. FitzPatrick - just a couple of years before Nazis were trying to make themselves feel at home there. This is a brief look at the Paris Exhibition of 1937, which included pavilions of other European nations that would be invaded by the Nazis even sooner than France.
According to Mr. FitzPatrick there were 44 nations with their exhibits on the banks of the Seine, showing the "faith in the ideals of man's humanity to man" on the eve of the world witnessing man's inhumanity to man - some of which was already taking place (Japan's invasion of parts of China, Germany already having concentration camps, annexing Austria, Italy invading Ethiopia, etc.).
It is very difficult for a modern viewer to watch things like the "modern" architecture of the Czechoslovakian pavilion with the knowledge that a lot of the architecture of that former nation will most likely be destroyed over the next 6 or 7 years.
There were also interesting exhibits from former French colonies: Indochina and French West Africa, which included Senegal, Dahomey (now Benin), the Ivory Coast (Côte d'Ivoire), Mauritania, French Sudan, and other colonies. There was also the Soviet Union's exhibit which included a Stalinist statue of a man and woman worker that was, according to Mr. FitzPatrick, about 100 feet tall.
The illuminated fountains were quite beautiful as were the fireworks displays.
This appears occasionally on TCM - it's definitely worth checking out.