This is a closeup of the formations at Mammoth Hot Springs in Yellowstone National Park. I visited Yellowstone in 2012 and stayed at the hotel at Mammoth Hot Springs. My typical morning walks were up to the springs and around the wood walking trails. This is just one of the many geothermal formations that Yellowstone has and is constantly changing. When you visit look out for the elk. There is a herd that lives around the area.