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.

Mammoth Cave National Park says this discovery further highlights the park's rich and diverse history of paleontological finds, which includes five shark species that are new to science.

Cave explorer Floyd Collins got trapped in Sand Cave in Kentucky 100 years ago and later died. The incident drew national attention and helped lead to the creation of Mammoth Cave National Park.

An epic archaeological discovery of a new species of ancient shark was recently made at Mammoth Cave National Park, dating back approximately 340 to 335 million years.

All Mammoth Cave tours can be reserved at Recreation.gov, the National Park Service's reservation website. You must have a ticket to enter the cave, and it is strongly advised to book in advance ...

Mammoth Cave National Park says this discovery further highlights the park's rich and diverse history of paleontological finds, which includes five shark species that are new to science.