The thermal features of Yellowstone National Park are certainly nothing short of astounding. The Grand Prismatic Spring is very aptly named due to its large size and amazing array of colors. It is in fact the largest hot spring in North America and the third largest in the world. The array of colors come from mats of bacteria that thrive in the 160° water.
On the day I took this picture I learned a lesson – Don’t visit hot springs on a cold morning. The air temperature was only about 40° and the result was a very obscured view of this natural wonder. Despite the fog and steam, it still made for a pretty scene.