Looking for a cool tunnel with no light? Flagstaff has one that was formed by lava.

A short Arizona trail ends at a dramatic cave where towering cliffs and far-reaching views steal the entire show.

Seven little campers turned into spelunkers this week and learned the ins and outs of Alabama caves during an event at the ...

When delicate cave formations are damaged, Carlsbad Caverns National Park calls on the fix-it skills of Michael Mansur and his growing legion of volunteers. Nothing good happens fast in a cave. Those ...

Jewel Cave, located 13 miles west of Custer, has more than 208 miles of “mapped and surveyed passage ways,” with hundreds of suspected passages yet to be explored, according to the National Park ...

Can Marçà was used around a century ago by smugglers who found in its hidden position an ideal place to conceal their goods.

Deep within the limestone mountains of Phong Nha-Ke Bang National Park in Quang Tri Province, Vietnam, scientists have ...

Most people come to Pictured Rocks National Lakeshore in Michigan’s Upper Peninsula for its namesake — the colorful, mineral-stained sandstone cliffs that line mighty Lake Superior. Those cliffs are ...

Vandals have damaged Fitton Cave in Newton County. They removed several cave formations, including stalagmites and draperies, said Cassie Branstetter, a spokeswoman for the Buffalo National River. It ...