The photo is real, probably undoctored. What people perceive another thing. Not long ago the big 'wow' on Mars was what looked like a doorway opening in a rock face only NASA pointed out that the image had nothing in it to give clue to scale and what they know the rock cliff it was part of the opening was tiny.
They are kind of resigned to rampant paradolia.Tho sometimes i suspect they release a suggestive photo for the fun of it. To hear what people see in it. And one could weave conspiracy theories around that if one is so inclined.
Again there is nothing to give us clues about size. The larger rock the small one is balanced on interests me because it looks sort of wedge shaped, as if it was cut. But there is another rock behind it, which may be almost as tall and lending support to the small one on top.
Don't get me wrong, i would not rule out that millennia ago an advanced civilization visited and may have left markers, or even that it had its own sentient population at some point. I'm just reserving speculation about individual photos till we have more.
When we consider what ancient ruins we've uncovered on earth that went undetected for centuries with tales of them being written off as folk tales till natural changes in landscapes or latest tech revealed them we can't rule much out.
A city over which Bhagavad Gita describes a sky battle taking place featuring a reluctant commander, Prince Arjuna, was long thought to be total fiction tho it is scriptural to Hindus. But like the Abrahamic scriptures the Gita may be embellished oral history.
Some early and not as long hidden discoveries were made when flight became more common because ruins of walls mad plant life grow shorter where they were. While patches of shorter growth might be noticed walking thu the areas, the neat patterns indicating deliver structures were only visible from some altitude.