Rocky Mountain National Park in the fall. Picture by Erik Stensland. Tweeted by the US Department of the Interior, 9/14/15.
Located at the crossroads of the Cascade, Klamath, and Siskiyou mountain ranges, Cascade-Siskiyou National Monument in Oregon has long been recognized for its ecological importance. The convergence of three geologically distinct mountain ranges resulted in an area with remarkable biological diversity. The Pacific Crest National Scenic Trail meanders 19 miles through the monument, offering challenging hikes with stunning views. Photo by Bob Wick. Tweeted by the US Department of the Interior, 9/15/15.
Wrangell-St. Elias National Park & Preserve in Alaska is the largest national park in the U.S. Four mountain ranges run through it, with nine of the 16 highest peaks in the country. Its Malaspina glacier is bigger than the state of Rhode Island and a diverse array of wildlife thrives in habitats from the mountains to the coast. At this time of year, the park is losing over five minutes of sunlight each day and autumn has already arrived. Enjoy these fall colors. They won’t last long. Posted on Tumblr by the US Department of the Interior, 9/16/15.