When it rains, it pours

[ezdays]

Years ago I was on a business trip and one of our stops was located inside an old salt mine. I'm not sure, but I think it was near Kansas City, Mo. Anyway, they had stores, shops and other businesses located down there. As I remember, there were pillars of salt that were left behind to provide support since there were no tunnels but rather a very large open area. I can't seem to find out anything about it on Google, but I do have a brochure that I brought back with me, if I can find it.