There is a cave in the world which has its own ecosystem. This cave has a forest, river, rocks, trenches and much more. It was declared the world's largest cave in 2009.

Impacts are expected to trail maintenance and other important services as the forest nears peak tourism season. Nonprofit Association of National Park Rangers says layoffs also happened at Mammoth ...

Today, visitors can explore the cave's cool, dark expanse by making a trek to the Coconino National Forest. The cave is open year-round, but roads may be closed in winter, making it temporarily ...

The need to install an emergency generator at Jewel Cave National Monument in South Dakota will require a temporary halt in ...

This story appears in the February 2012 issue of National Geographic magazine. She is lying in a cave, dying. Legs and arms but knobby sticks, Lidia Maiyu is curled up close to the campfire.

The couple has spent most of their lives in caves, and this one has been their main home for the past several years. "In March, when the weather warms, I will return to the forest," Ne said in the ...