Image: Alex Smith
6. Big Daddy and Dune 7
The brilliantly named Big Daddy is one of the most famous of the many sand dunes in Sossusvlei, Namibia. It is also the one of the tallest, standing some 1,066 feet (325 meters) in height, and is composed of five-million-year-old sand.
Image: Michael Paskevicius
Another Namibian Desert dune that’s even bigger is Dune 7, which has been measured at over 1,256 feet (383 meters) and is so named because it is the seventh dune one encounters after crossing the river Tsauchab.