Explore the rugged terrain and rare plants at one of Arizona's newest and barely visited national monuments, a serene cactus forest in the middle of the desert.

This year’s crop of about 30 Christmas trees was ... introduced to Arizona in the 1930s to feed livestock and control erosion. It has since exploded into a major threat to the desert ecosystem ...

Botanist Gustaf Starck rallied people passionate about preserving desert plants with a sign outside his Scottsdale ranch.

A sun-swept corner of the Painted Desert draws more than 600,000 visitors each year. While most come to see one of the world's largest concentrations of brilliantly colored petrified wood ...