“It’s 70 and overcast every day, regardless of what’s going on outside,” says Joe Paris of Paris Brothers, one of the companies that rents space in SubTropolis, an underground business park, per Hunt Midwest. His workplace is a limestone mine near Kansas City, Missouri, retrofitted into a city that never sees the light of day.
It began in 1945, when Midwest Precote started lateral mining of limestone east of what is now I-435 in Clay County, according to Hunt Midwest. The company had started in 1931, selling asphalt-treated aggregates and grew into a major Kansas City crushed stone provider.
Underground storage was up and running by 1964, with Ford, Pillsbury and Russell Stover among the early tenants, Hunt Midwest says. The first tenant was a construction company that stored equipment underground to avoid winterizing it, per KCUR. In 1970, a company with Kansas City Chiefs founder Lamar Hunt as a key investor bought Midwest Precote.
These days, the tenants are a little more varied. KCUR‘s 2017 tour found the U.S. Postal Service storing rare stamps, a company making cave-aged cheese, and film canisters kept in a 45-degree vault. At Ground Effects, which installs truck bedliners, manager April Adams joked, “We get nice fluorescent sunshine down here.”
How big is it? “It would take 42 Arrowhead Stadiums to fill the developed portion,” Mike Bell of Hunt Midwest told KCUR in 2017. Other counts vary by source. Missouri Partnership put the workforce at 2,000 across more than 55 companies in July 2024, while Hunt Midwest’s website lists more than 2,500 employees and 13 miles of lighted, paved roads.
The constant temperature does the heavy lifting on the power bill. “We’re probably using about 75 percent less electricity underground than we would in an above-ground facility,” Paris told Atlas Obscura.
SubTropolis is not the only old limestone mine with a second life. In Kentucky, Louisville’s Mega Cavern was carved out over decades as a limestone quarry and is now an underground adventure attraction.
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