Cathedral Caverns State Park in North Alabama has the largest cave mouth in the world, its also about a 15 minute drive from my childhood home. We went all the time when I was a child and I remember going there and hearing the tales of native people, pioneers, and outlaws who all were parts of the caves history. At least according to the tour guide. I remember this opened up a lot of questions about history to me and I can remember asking my father about all sorts of other historical topics when we would go to the cave. To this day, these are fond memories of my historical understanding.