"Ever heard of the Richat Structure in Mauritania, Africa?" No, I have not.
"Do you believe the ancient city of Atlantis is a myth, or it is true?" It would be fun if there had been such city, but I believe it is a myth. There's an Atlantic City, New Jersey, but I don't believe there was a city of Atlantis. Lets found a city and call it Atlantis. Then, it will definitely be real.