You can see more images of Flensted's trip on his Instagram.

From towering dunes to sweeping desert landscapes, the U.S. is home to some of the largest and most stunning sand dunes in the world. Discover where to find these natural wonders and plan your next ...

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. At about 1,400 square miles, it is said to be one of the most impossible areas ...