Richat is interesting but randall makes a good case that it’s a volcanic formation of some kind, if i am remembering correctly.

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I feel there's more to the richat though, humans occupy volcanic spots all the time, the structure beeing volcanic in nature does not invalidate that humans can't use it and build cities on top of it, like in every island out there today... also, no one really knows for sure what the pillars of hercules / heracles were and we suppose it's the Strait of Gibraltar, but in reality could be some place else.