Sand dunes give up secrets of lost wartime railway / Popular Dorset beach needs a new plan for sand dunes as they could block million-pound homes' sea view / Endless sands: Stunning crescent dunes of Chile's Atacama Desert / Man gets third-degree burns from walking on sand dunes in Death Valley / Tourist gets third-degree burns walking on blazing hot sand dunes in Death Valley, rangers say / Death Valley tourist gets severe burns hiking sand dunes in 123-degree heat / South Australian coastal dunes are on the march / Image: Barchan and linear dunes on Mars / Rippling sand dunes, icy cliffs spied near Mars' north pole (photos)