From a failed health experiment, to slave mining of a valuable chemical compound, to potential ways to make money from ...

In a one-of-a-kind ceremony beneath the surface of Kentucky, 30 people from around the world were sworn in as U.S. citizens.

Twenty-nine new citizens are celebrating after a naturalization ceremony Thursday at Mammoth Cave National Park. Park officials say the ceremony took place at an area known as The Methodist Church ...

Tucked beneath a historic La Jolla shop lies Sunny Jim’s Sea Cave—California’s only sea cave accessible by land. With a ...

A 26-year-old Mammoth Mountain employee died from hantavirus. An investigation found mice droppings at the hotel where he ...

Scientists found that a "cap" of bubbles and magma stands between the magma reservoir underneath Yellowstone National Park ...

In northeastern California, the Upper Pit River undulates through evergreen forests, wet meadows and rugged mountains. It’s ...

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