White Sands National Monument in New Mexico is one of the world's great natural wonders. Here, great wave-like dunes of gypsum sand have engulfed 275 square miles of desert, creating the world's largest gypsum dune field of brilliant snow-white sand. This photo of a double rainbow over the park was taken just at sunset as a rain storm let up. Photo by Raymond Lee. Posted on the US Department of the Interior blog, 10/19/15.
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