This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

When you think of towering sand dunes, your mind probably drifts to the Sahara or perhaps ... skies make it an incredible spot for night sky photography. With endless fjords, hikes, and natural ...

This striking astronaut photo shows off an "eye-catching" impact crater in the Sahara Desert. The oculus-like structure is ...