Cave Creek Campground in Oregon Caves National Monument and Preserve offers an amazing opportunity to camp in an old-growth ...

Stalagmites that formed in caves hundreds of thousands of years ago preserve a record of how fires behaved the last time Earth’s temperatures were as high as they are today. New Scientist ...

Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.