SubTropolis - Wikipedia
en.wikipedia.org › wiki › SubTropolisSubTropolis is a 55,000,000-square-foot (5,100,000 m 2 ), 1,100-acre (4.5 km 2) artificial cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility. Developed by late Kansas City Chiefs owner Lamar Hunt via Hunt Midwest Real Estate Development ...