Our Pick
Posted on @rawstates
The Louisville Mega Cavern
1930
Louisville, Kentucky
A limestone mine dug out under the city for a century left a hundred acres of rooms seventy feet below the surface, big enough that it was designated a fallout shelter for fifty thousand people in the Cold War, stocked with rations. It now holds an underground bike park, a zip line and, at Christmas, a drive-through light show, all beneath a neighbourhood that mostly does not know it is there.
That was 1 of the hidden places.
Location: historic site
This place has its own thread on r/rawstates
Read what people are saying about it, or add your own.