You’re referencing the megalithic technology evidenced around the planet with no known culture, upon which later cultures built upon their foundations or were falsely-credited with having built.
There is an interesting hypothesis that Atlantis was located at the Richat Structure in Africa. Worldwide fables of a flood point to a global catastrophe like a pole shift or impact event.
It’s rather interesting how all things seem to tie together and displace orthodox “history” according to archaeologists...a field of study I’ve found rife with rather non-scientific minds.
I’ve seen that theory, and it is interesting. Assuming that those rings were once separate and water-filled, it would be an incredible citadel with a little work. Still, should be easy enough to prove or disprove, with a little digging .
The flood definitely happened and consensus is accumulating that it was caused by the Younger Dryas impact in Cananda while covered by an ice sheet. That’s why there is no crater.