This canyon is nearly impossible to reach on foot, so I used a drone to explore what the Arizona desert normally keeps hidden. Steep drop-offs, loose rock, and rugged terrain make this place extremely dangerous to hike, but from the air, it reveals details you’d never be able to see from below. I carefully fly my drone deep into the canyon walls, scanning caves, alcoves, and hidden crevices for anything unusual — from signs of ancient human activity to fossils left behind when this land was once underwater.