According to the Greenspring Media publication  "Bloomington-Mall of America Visitors Guide", when was the Mall of America opened?
Greenspring Media Greenspring Media is a publisher of Minnesota-focused publications. The company publishes two subscription magazines, "Minnesota Monthly" and "Midwest Home", as well as custom publications including "Real Food", "Where Twin Cities", "Twin Cities Living", "Minneapolis Meeting & Planner's Guide", "Bloomington-Mall of America Visitors Guide" (in partnership with Bloomington Convention & Tourism Bureau and the Mall of America), "Minneapolis-Saint Paul Official Visitors Guide", and "Visit-TwinCities.Com".
Smithsonian Gardens The Smithsonian Gardens, a division of the Smithsonian Institution, is responsible for the "landscapes, interiorscapes, and horticulture-related collections and exhibits", which serve as an outdoor extension of the Smithsonian's museums and learning spaces in Washington, D.C. Established in 1972 as a groundskeeping and horticulture program, Smithsonian Gardens currently manages 180 acres of gardens on the National Mall, 64,000 square feet of greenhouse production space, and the Archives of American Gardens, a research collection of over 60,000 photographs and archival records covering American landscape history from the 1870s to the present.