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.

Floyd Collins got trapped in a Kentucky cave 100 years ago this week, an incident that led to the creation of Mammoth Cave National Park.

Some of the most amazing spectacles around the world are hidden deep underground, beneath rocks, sea and even ice.

For 16 years, the Buffalo National River has denied explorers access to Arkansas’s longest cave and hundreds of others. Some Arkansas cavers want to change that.

Mammoth Cave is a solution cave, the product of a karst landscape. Karst is a topography formed from the dissolution of soluble rock like limestone by weak acidic water. Sinkholes, ridges, springs, ...

With a vast expanse of natural splendor, South Dakota is rich in history, outdoor experiences and unique activities. In the Mount Rushmore State, visitors will find two of the world's longest ...

Lime occurs very extensively distributed in nature, principally in combination with nitric, carbonic, and sulphuric acids—as in limestone ... instanced in the Mammoth Cave, Kentucky.

The change caused a die-off of marine species, their remains sinking to the seabed and preserved underground in the resulting rock layers. The flowing water that formed Mammoth Cave cut through this ...

There was a lot of mud inside the caverns from the door all the way back. The only way we could get that out was with wheelbarrows and shovels and ...