OK I just discovered: The Eye of the Sahara, AKA the Richat Structure (Richat being Arabic for feathers)
It's about 30 miles across and is difficult to spot unless you're viewing it from space. It's located kinda right in the middle of Mauritania.
It's not a crater, it's the remnants of a symmetric anticline--basically a dome of lava rose up from under the ground 100 million years ago, deforming the sedimentary rock above it. The erosion since then exposed the concentric rings.
Richat Structure would be a great band name.
Also, the typical selection of assholes want you to think this is where Atlantis once was.
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