This park features a spectacular limestone karst landscape with an underground river. One of the river's distinguishing features is that it emerges directly into the sea, and its lower portion is ...

Decreasing precipitation and rising populations could bring a perfect storm of water shortages for the United States. Where is our water going? A thunderstorm sweeps across Nevada, a state in which ...

After you've admired the Grand Canyon from the hiking trails (or even from the air on a helicopter tour), enjoy a new vantage point on a Colorado River rafting tour. Options range from the ...