According to a person who lives nearby
they are standing on Preacher's Rock looking at God's Door
a trucker & a troubadour
Doris McIntire née Martin and Sidney Chester McIntire
my grandmother and my biological grandfather
1928 photo at the Grand Canyon during their Boston to Honolulu honeymoon drive via Key West & Havana, Cuba
The bottom right of the photo shows a rock formation commonly referred to as God's Door. The rock on which my grandparents are standing is called Preacher's Rock. Presently, there is a large sightseeing structure built on top of Preacher's Rock to prevent erosion. Apparently, one is unable to stand where they are standing in the photo.