"Sinkholes are most common in what geologists call, 'karst terrain'," the US Geological Survey explains. "These are regions ...

Rockport State Recreation Area is known to have exposed fossils from the Devonian period – more than 400 million years ago.

Magnificent waterfalls, take-your-breath-away vistas, and glorious stretches of sandy beaches—Southern state parks are some ...

This edition, Olivia interviews Rob Abram who has cultivated, mastered and shares his hobby of hunting and tumbling some of ...

One of the world's deepest and most dangerous caves lies in Abkhazia, a disputed part of Georgia. It takes days to get to the ...

To find the Groundwater Vein campsite in Area 14, look for the cave east of the oasis in the plains. Head underground and drop to the very bottom of this cave. As soon as you do, look left to spot a ...

In a remote region of British Columbia, the Chilko River offers isolation, elite paddling, and continuous rapids.

From the glaciers in Patagonia to the sand dunes in Namibia, here are 57 gorgeous photos of the last unspoiled places on ...

Kentucky lawmakers may vote to allow unrestricted pollution of the sources of many drinking water supplies. Here’s where, and how, people could be especially affected.

The world is filled with astonishing locations that defy belief, each with its own unique story and allure. Let's embark ...

Jeopardizing the livelihoods of the men and women who work for our national parks is abhorrent. Their jobs are not only vital to the environment, but they also preserve the crucial history of these ...