Known as total cloud inversion, the weather phenomenon is quite rare—and spectacular
We know where the bodies are buried ... take a virtual tour of world cemeteries that host famous artists and rogues
All across the country, birds are making the trek south for the winter—here are some of the best places to witness their journey
President Obama grants federal protection to half of the California mountain range
Old mines, abandoned buildings, and the occasional curse: Ghost towns cover the United States, and they make for a fun detour
The 43rd Albuquerque Balloon Fiesta sends hundreds of hot air balloons soaring into the sky
Want to be dazzled by Mother Nature’s fall foliage display? Just hop in the car.
New measurements revealed the world's largest cave, which is unfortunately off-limits. But what are some other impressive underworlds open for visitors?
Driven to extinction by overhunting, the world's last Pinta Island tortoise is now a taxidermy display at New York's American Museum of Natural History
In 1967, the United States Geological Survey turned an old volcano into a lunar training ground for astronauts
The Pennsylvanian city had more lives than a cat and thrives as a hub of innovation
Inside the agency's headquarters is a museum filled with relics from half a century of cloak-and-dagger exploits
Shipwrecks, poetry and alien encounters: The lighthouses dotting Maine's coast pack a double punch of beauty and history
To celebrate the 50th anniversary of the Wilderness Act, explore 50 different wilderness areas around the country
Familiar fare—qeema, biryani, dolma—offers comfort to the thousands of refugees starting life over in Phoenix
Caribou, glaciers, World Heritage Site
String bogs, sand dune islands and carnivorous plants
The continental divide, wild rivers and grey wolves
Pristine sandscapes, boreal forest and wild game
Rocky plains, upland bogs and a variety of flora
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