PBS Terra | Can anyone explain this giant structure in the Sahara? @pbsterra | Uploaded 2 months ago | Updated 4 hours ago
It's not aliens. It's not Atlantis. It is a geological wonder called the Richat Structure.

Hosted by Joe Hanson from Be Smart, Overview uses stunning 4k drone footage to reveal the natural and human made marvels shaping our planet--from a 10,000-foot view--literally.

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