Here's an amazing look at Exposition Park 70 years ago, dating from the 1932 Olympics!
This wonderful image is courtesy of Edward Garcia from the Science Center's Exhibits Department.

1932 Exposition Park Map

Mr. Garcia also shares this image of the old theater which existed in the basement of the Agricultural Exposition Building.
The theater was lost during the post-war remodeling that took place in the late 1940s.

Agricultural Building Theater