Hmmm. What is that? Could it be the eye of a hurricane? Jupiter’s Great Red Spot turned blue? An ammonite? All acceptable guesses. The phenomenon sits in barren Northwest African terrain of the Mauritanian Sahara. A mystery that has intrigued scientists, geologists, astronomists and laypersons alike since its visual discovery by orbiting astronauts during the dawn of space travel. Le Guelb er Richat, or the Richat Structure.