In the heart of Dasht-e Kavir, a large desert in Iran, there is an enormous area of sand dunes known as Rig-e Jenn ... to set up camp for the night. "The drive itself was an experience," Flensted ...

Crescent-shaped sand dunes rise and fall steeply ... while adrenaline junkies race through the sandy mountains in four-wheel drive cars. But our desert hike is quiet. We are silent, solemn ...