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Richat Structure ‘ Guelb Richat’ (Coordinates 21.124°N 11.402°W)

Also know as Eye of the Sahara, is a famous geological circular area in the Sahara. It has the diameter of almost 40 km. The eye is composed of kimberlites, lave flows, volcanic rocks and other substances. The structure was a once a distinctive landmark for astronauts as they pass across the Sahara. Looking from space, it forms a breathtaking, wonderful bullet’s-eye, but it’s really hard to spot the Guelb on the ground level, since the human eye cannot have more than 30 miles in one frame.
The formation of the Eye is still an intriguing mystery, but Scientists, though uncertain, believe that the Eye could’ve formed over 100 Million years ago.