New interior secretary quietly orders millions of acres of protected lands to be reviewed for potential oil, gas, uranium and ...

Nature’s underground wonders have captivated explorers and curious travelers across the country for centuries. From ...

One of the most well-maintained mining villages is in Pennsylvania. Visitors can view houses that date to the 1850s and learn ...

This giant natural cave is right below one of America's favorite theme parks (and yes, you’re allowed to explore it).