We left Atlanta on December 27th and headed north, stopping for soul food at Southern Star in Chattanooga, our borrowed Kia Sedona packed for 1,000 miles of exploration across the Bluegrass State.  A couple hours later, we were peeing at the Kentucky Welcome Center off I-65, and 45 minutes after that, pulling up to Mammoth Cave National Park. Here’s what’s ridiculous about Mammoth Cave–it’s 80 miles from where I grew up in Hendersonville, TN. I loved exploring caves as a kid; we had a few within biking distance,…