Cotton-candy yellows and pinks color the hills of Badlands National Park in South Dakota. The Badlands’ striking formations contain one of the world’s richest fossil beds, carrying clues to ancient mammals like rhinos and saber-toothed cats that once roamed here. Photo by Brenda Bergman. Posted on Tumblr by the US Department of the Interior, 2/17/16.
Glacier National Park in Montana, pictured here on a spring day. Photo by Greg Chancey. Posted on Tumblr by the US Department of the Interior, 3/3/16.