For millennia, the Eye of the Sahara was hiding in plain sight. That's because this huge and mysterious geologic formation is hard to spot from ground level. It turns out we only really discovered this incredible bullseye in the sand when we began sending humans into space.
The Eye of the Sahara, which is more formally known as the Richat structure, is located in the western Sahara Desert in Mauritania. For a while, scientists did think that the Eye of the Sahara was an impact crater. But they didn't find enough melted rock to make that guess hold water. Current theories suggest a much more complicated story behind this incredible natural formation.