I remember the Climatron, the structure in the background, being built in the late 50’s, early 60’s. It was the first geodesic dome to be used as a conservatory and opened to the public on October 1, 1960 on the grounds of Missouri Botanical Garden in St. Louis. The design of the Climatron greenhouse was developed by St. Louis architects Murphy and Mackey, winning the 1961 Reynolds Award, an award for architectural excellence in a structure using aluminum. The design was part of an architectural revolution in 1950’s St. Louis that included the St. Louis Arch, Lambert – St. Louis Airport, St. Louis Priory and more.
The photo here shows it as part on the Botanical Garden’s Garden Glow event. See more photos of St. Louis’ Missouri Botanical Garden: https://greatrivers.smugmug.com/Galleries/Missouri-Botanical-Garden