In some places, sand dunes protect shorelines from the onslaught of ocean waves. In other places, the dunes themselves are on the move, and threaten human structures. Host Flora Lichtman talks with ...

The sand is hard at the water’s edge. South of Florence, on the Oregon Coast, you can walk the beach for miles and barely leave an imprint. Dig holes, build castles, turn somersaults, your meager ...

On the Atlantic coast of France, about 40 miles/66 km southwest of Bordeaux and 7 miles/12 km south of Arcachon, is one of France’s most striking natural wonders: Dune du Pilat. Rising straight from ...

Last summer, Stephanie McNamara got her first glimpse of Great Sand Dunes National Park and Preserve in southern Colorado. The park is a monument to sand, where dunes stretch across 30 square miles ...

This intriguing astronaut photo shows a trio of ancient "black mesas", which sit side-by-side in the Sahara desert. The dark structures have enabled a series of rare sand dunes to form around them ...