If you're looking for a unique national park to visit, then this Kentucky staple is well-worth adding to your bucket list.

The air is cool and damp. The light shining from behind is low and tinted, while a park ranger's hand hovers over a button. Then, a switch clicks. Light floods a chasm in the stone, a chamber called ...

Along with underground adventures, Mammoth Cave National Park in Kentucky offers great hiking and kayaking, too.

Mammoth Cave National Park is Kentucky's lone national park. However, it isn't the only cave in Kentucky, or even the area. There are even more caves near the park and around the state than the caves ...

Add Yahoo as a preferred source to see more of our stories on Google. The entrance to the cave looks sterilized — a stainless steel door that wouldn’t seem out of place in a hospital looks wholly ...