There was a story on NPR's Market Place on Wednesday about an abandoned limestone mine turned into an underground secure industrial park. <http://www.marketplace.org/topics/business/subtropolis-yeah-its-pretty-underground>. I'd heard of such places before, and in fact anyone who went to the NSS Convention in Indiana in 2007 attended the photo salon and banquet in such a facility. This one in Kansas City is apparently the largest in the world. Full story at <http://www.bloomberg.com/news/features/2015-02-04/welcome-to-subtropolis-the-business-complex-buried-under-kansas-city>.
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