Experience the incredible Mammoth Cave in Kentucky, officially the world’s longest cave system with over 426 miles explored. This historic tour highlights its vast underground passages, geological ...

The fossil was found in the Ste. Genevieve Formation, which dates to approximately 335 to 340 million years ago. It was discovered by a combined team of scientists from the National Park Service ...

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 ...

Mammoth Cave, the world's longest known cave system, stretches 426 miles under Kentucky. The cave's limestone began forming 330 million years ago when the region was submerged under an ocean. Visitors ...