Businesses that rely on tourist revenue near the Grand Canyon have taken a major hit as wildfires rage across the region, destroying more than 100 structures in the park.

A new report has calculated that making national parks the responsibility of states would raise costs, cut revenue and reduce access for Arizonans.

She was written out of Grand Canyon history, but fires are putting her iconic buildings at risk. Meet Mary Colter, the architect you've never heard of.

Sen. Mark Kelly says, despite the damage done by the Dragon Bravo Fire, letting some fires burn can be important to reduce risk.

A new study suggests ancient wood floated into a cave far above the Colorado River when a meteorite-induced earthquake triggered a landslide, a dam, and an ancient lake.

The Dragon Bravo Fire started on July 4 and was managed at first as a controlled burn. Then the wind picked up, and it quickly became uncontrollable.