Telluride is a Cubist’s rendering of mountains. Overlapping triangles rim the horizon; the valley floor meets the box canyon walls at neat right angles; a few oval abstractions soften the ...

A red-hot lava flow two miles long has been attracting crowds to the slopes of Mount Etna on the island of Sicily, Italy.

The National Park Service is hosting its annual Death Valley Dark Sky Festival beginning Friday, Feb. 21 through Sunday, Feb.

For many people, the "King" Columbia River begins and ends with the Grand Coulee Dam, the iconic 1930s project that produces ...

The McDermitt Caldera, an ancient supervolcano straddling the Nevada-Oregon border, may hold the world’s largest lithium deposit ever discovered. With estimates ranging between 20 and 40 million ...