Kansas City spent decades digging limestone out of the ground. Nowadays miles of tunnels have been turned into commercial space for all kinds of businesses. The largest, apparently, is 55,000,000 square-foot. 1,100-acres. We drove through it today just for fun. It's named "SubTropolis." Trippy!

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@deafferret is the one I was most aware of, they advertise constantly on KC stations

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