Scientists obsessed with Death Valley's sailing stones have solved the Racetrack Playa mystery.
Glaciers retreat in Alaska, two tropical storms harass Hawaii and dust covers the Red Sea.
The U.S. National Park Service has an important message for visitors: Leave your drones at home!
More than 500 firefighters are battling the El Portal Fire in Yosemite National Park, which has spread across more than 3,500 acres and threatens nearby homes, campgrounds and roads.
'World-class' track site in Denali National Park shows that herds of duck-billed dinosaurs thrived under the midnight sun.
Agency for nation's national parks, monuments and historical sites, outlaws launching, landing or operating drones over federal lands and waters.
An expansion of the Pacific Remote Islands Marine National Monument would protect one of the few large unspoiled sections of ocean waters on the planet. Continue reading →
President Obama announces the expansion of the Pacific Remote Islands Marine National Monument from almost 87,000 square miles to nearly 782,000 square miles.
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