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.

To prevent further destruction of its unique bounty, 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 ...

One of the world’s oldest national parks, Mount Rainier became part of the federal system in 1899, shortly after its last eruption. Park status was the culmination of a long campaign by John ...

Robert F. Kennedy, Jr., calls the Great Bear Rainforest "the planet's last large expanse of coastal temperate rain forest." Stretching for more than 250 miles along the coast of British Columbia ...