Richat Structure, Mauritania

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Also known as the eye of the Sahara, this incredible geographical feature is found – as the name suggests – in the Sahara Desert. It is so wide – 30 miles across – that you wouldn’t detect it if you were standing in it, but from a plane, or even from space – its simply breathtaking.

Photo credit: ConservationInstitute – 10 of the Most Mysterious Places on Earth