You've already posted this.

https://news.ycombinator.com/item?id=49667272

Kinda wonder why ancient people didn't look at that and turn it into a massive amphitheatre or a mythical city.

Because from the ground it doesn't look like anything at all. I've been there, and without knowing where I was, I never would have guessed that I was inside the structure.

Maybe because it's in the middle of a desert.

Quoting from the wiki article

""The Richat Structure has been the subject of unsubstantiated fringe claims to be the site of Atlantis mentioned in the works of Plato.""

I wouldn't believe that claim either if there is no archeological evidence, but I'm wondering why there isn't actually some civilization that walked by, said "this shit is cool", and built a city there.

If I was an ancient pharoah I certainly would have ordered a city built there. Maybe with a nice pyramid in the middle instead of some burning man

Because barely one lived out there then and even fewer now.

Something with a name reminiscent of the Atlantic Ocean.