Another Grand Canyon pic. Circled area has hikers on the trail. See zoomed in snip below. Also, note the lodge and buildings up on the canyon edge in the upper right part of the pic. Gives an idea of the scale of it. It's apparently 5000' deep.
And snip zoomed in to see hikers on the trail to the bottom. They're the little black vertical dots just to left of the snowy area on the trail and over to the left where the trail curves.