[an amused spectator]

http://www.illinoismysterycave.com

This one is way out there. ;-)

You ever hear of it?

[Ford Fairlane]

I have heard of that cave, dont remember the datails

There were supposedly similar sites found in Tennesee & Kentucky (farther east)

[blam]

"You ever hear of it?"

No, I have not heard of that site.

I know that cave as Burrows Cave from Ancient American Magazine