The post The Ellison Cave System Boasts Two Of The Deepest Freefall Pits In The United States first on TwistedSifter.

An explorer of the Mammoth Cave system in Kentucky who died 100 years ago is credited with the creation of the national park.

Bison, pronghorn, prairie dogs, and the third longest cave in the United States. You’ll find all this and more when you visit Wind Cave National Park in South Dakota, where there is as much to see and ...

The death of Floyd Collins one century ago is being remembered as a catalyst for the formation of Mammoth Cave National Park, ...

Carlsbad Caverns is home to some of the most spectacular examples of underground geologic features found anywhere in the United States ... limestone caves carved over the course of 250 million years.