'Eye of the Sahara' spotted from space, pics released

The Richat Structure, also known as the 'Eye of the Sahara', was pictured from the International Space Station (ISS) as it orbited over 250 miles above North Africa. It is an eroded geological dome in Mauritania. The circular geologic feature is thought to be caused by an uplifted dome that has been eroded to expose the originally flat rock layers.