EYE OF AFRICA - MAURITANIA In the Sahara Desert of Mauritania. This natural phenomenon is a richat structure caused by the dome shaped symmetrical uplifting of underlying geology now made visible by millennia of erosion. This can be seen on google earth.
Fire rainbows are the rarest of all naturally occurring atmospheric phenomena. For a fire rainbow to occur, cirrus clouds must be 20,000 feet in the air with the precise amount of ice crystals, and then the Sun must hit the clouds at 58 degrees. *Stardust*