Hidden beneath the Guadalupe Mountains, these caverns are a natural marvel, with over 119 caves formed from limestone. The ...

James Larkin White, 18-year-old cowhand, discover in 1901 the world’s greatest and most spectacular underground wonder, ...

One of the most exemplary caverns in the system is known as the Big Room. At nearly 4,000 feet across and 255 feet high, the Big Room is the fifth-largest underground chamber in the United States.

and Deepest Committee,” such a feat would be a very big deal. Elsewhere far below the Earth’s surface, in the entrails of Racer Cave, another team was slithering into place. They too carried ...

This cave on a hillside near Tarbox Pond may have been a winter shelter for the Narragansetts. Find out why it's also known as "Witch's Cave." ...

The cave that the Kanohina system seems poised to supplant in the record books is on the other side of the Big Island. It was likely created during a 15th-century eruption of a different volcano ...