It is also found in similar artwork on Celtic crosses and slabs from the early Christian period. The fact that the triquetra rarely stood alone in medieval Celtic art has cast reasonable doubt on its use as a primary symbol of belief.
Namibia, the second-least densely populated country in the world is also one of the newest, and is home to some of the largest sand dunes, the darkest skies, the oldest cultures, the biggest conservation areas in Africa, the worldâs last rhinos and the most complex languages on the planet â to name but a few!
The magnificent sand dunes are, of course, the main attraction at Great Sand Dunes National Park. Scientists believe that the sand that comprises the dunes has been in the San Luis Valley for 35 million years. They are a product of winds blowing predominately in opposite directions. 2  Star dunes: The many arms of star dunes are shaped by winds blowing in all directions. 3  Parabolic dunes: Oblong designs are formed when vegetated sand prevents parts of the dune from migrating.