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

A wildfire that tore through a historic Grand Canyon Lodge​ had been allowed to burn for days before erupting over the weekend, raising questions about federal officials' decision not to aggressively attack it right away.

Partial blue skies in the morning allowed many park visitors to ignore fires on the North Rim. By afternoon, ashfall made for a different story.

“The North Rim of the Grand Canyon is like another world,” said Ethan Aumack, executive director of the Grand Canyon Trust, who has fond memories of skiing through the woods to the rim after the lone road that leads there closes for the winter. “It feels like a much more personal place.”

Officials in Arizona and Colorado have closed huge swaths of parkland to visitors after lightning-sparked blazes destroyed thousands of acres and hundreds of structures

Researchers have found a link between two geological events in iconic locations of the U.S. Southwest that scientists previously didn't think had anything to do with each other.