There’s a vast expanse in New Mexico where you can hike barefoot, sled any time of the year and feel like you're on another planet. Welcome to White Sands National Park. A national monument ...

They may look like mounds of snow, but the dunes in this park are made of a rare form of crystallized gypsum ... Hiking and sledding over this vast white expanse of powder is a singular, otherworldly ...

They clip barefoot human tracks along their length ... according to the study. White Sands National Park is is south-central New Mexico, about a 100-mile drive north from El Paso, Texas.