Beneath the United States lies a surprising network of caves shaped over millions of years. Some feel almost otherworldly, with strange rock formations and the occasional glow from naturally occurring ...

FRANKLIN COUNTY, Mo. — The fight over two massive proposed data centers in rural Franklin County has brought hundreds of residents to public meetings, kept a planning commission up until 4:30 in the ...

Imagine, in the 21st century, discovering a marvel on par with Mount Everest or the Grand Canyon. It happened, in 2009, with the revelation of the largest cave passage in the world. It's in Vietnam ...

The Natural Bridge Caverns are home to the biggest commercial cave system in Texas. Above-ground adventures include zip lining, a rope course, a maze, gem mining, shopping and dining. But the primary ...

One of the city's more unique attractions, the 100-acre Louisville Mega Cavern, which was created out of a 19th-century limestone quarry, now houses the world's only underground zip line course. But ...

There are faster ways to get from Chicago to Los Angeles, but none have the allure or cultural cachet of Route 66.