The city of Tucson, Arizona, sits on America’s southern border, surrounded by the cactus-strewn landscapes of the Sonoran ...

Parts of Alaska are warming up to four times faster than most of the rest of the world. That's forcing tough choices for ...

M ore than 10,000 years ago, a group of Indigenous Americans with close genetic ties to the mysterious Clovis people buried a ...

A collection of indelible photographs, maps and “intimate guides” from 1807 to 1940 went beyond extolling the virtues of the ...