The Grand Prismatic Spring in America's Yellowstone National Park measures more than 360 feet across and 131 feet deep. At the center of the spring, the temperature is too hot to sustain any life so you get clear blue tones, but as the water cools and spreads, different photosensitive bacteria move in and create different colors. For more info and pictures, visit http://www.yellowstonepark.com/grand-prismatic-midway-geyser-basin/