Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.

the area was designated a national monument in 1906 and a national park more than a half century later. If you are traveling west on I-40, exit into park. When leaving the south end of park ...

While many of these trips are motivated by a genuine appreciation for nature and culture, the trend also raises an important ...

The creation of three "dire wolf" pups has raised hopes that it may be possible to resurrect extinct animals. But some scientists have grave concerns. Swathes of scientific data deletions are ...