There is a cave in the world which has its own ecosystem. This cave has a forest, river, rocks, trenches and much more. It ...

Credit: NPS Illustration / Benji Paysnoe Researchers collecting fossils deep inside Kentucky's Mammoth Cave have uncovered the remains of a never-before-seen species — an absolutely tiny ancient ...

The largest cave in the northeastern United States is expected to become Pennsylvania’s 125th state park and first underground park. During Gov. Josh Shapiro's proposed budget address Tuesday ...

the sound can be heard anywhere from within the cave system, which covers about 64 acres (260,000 square meters). That makes it the largest musical instrument in the world. We’ll save the ...

They had crawled into Cave of the Winds ... The rest of us explored below, pressing forward, sounding the planet’s largest known enclosed space. Overhead the swifts chattered and bickered ...