Al Naslaa Rock Formation in Saudi Arabia
science101.com
science101.com
I'm pretty certain this is all easily explained by simple weathering and there are quite a number of examples of this kind of rock in the geological literature.
Obligatory Ancient Aliens: https://www.youtube.com/watch?v=RJMZyl6zbKU
Aliens with lasers? Please.
All of the ancient megaliths, Old World and New, share well earned fascination. But what is fascinating is how people (often) without metal tools, materials science, advanced mathematics, or so much as a block and tackle, cut, transported, and fitted such monstrous stones into edifices that often still stand.
What is certain is that we still have a great deal more to learn about what the ancients did, and how, than we now know; and plenty of that cannot fail, if ever elucidated, to astonish us, if only we pay attention.
Is this one natural? It is hard to believe. Is it a made thing? That seems equally hard, but for different reasons. People insisting on one or the other know less than those who admit they don't know.