How far would you go for a fossil? On a two-year retrieval mission of nearly 60 hours in an underground cave, we met our limits—and went beyond. The limestone slope of Potholes Cave Reserve is ...

Lights Under Louisville, located in the Louisville Mega Cavern, is a magical drive-through holiday light show situated 100 feet below ground. "Because we are underground we're dark all the time ...

Caving (or spelunking) is an adventurer's unique opportunity to explore the hidden wonders beneath the earth's surface ...

Under a black light, the chemicals fossilized within shine in brilliant hues of pink, blue and green. Scientists are using these fluorescent features to understand how the caves formed and how ...

The surface of Mammoth Cave National Park ... a match and the tiny dot of light magically spreads, illuminating a circle of astonished faces. Year-round. Underground, all days are about the ...

One of the planet’s largest underground passages ... except for the instant when a photographer’s flash dumps light through a cavern, most everything is invisible. With no sunlight to measure ...