Star dunes - sometimes called pyramid dunes - stand out among sand dunes for their towering height and eye-catching form.

Sand dunes often provide the backdrop for a scenic ... you'll find the equally impressive Landes de Gascogne Regional Nature Park, the largest artificial forest on the continent.

This giant sand dune in southern Spain is about 98 feet high and 656 feet wide, making it one of Europe's largest sand dunes. What is perhaps even more fascinating is what hides beneath it.

With this amount of sand coverage, there’s still plenty of opportunity for the formation of vast dune seas, known as ergs.

How can something that is constantly shifting stand up to 750 feet tall? This southwestern park features the largest sand dunes in North America, and the key to their extraordinary height seems to lie ...