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Grand Prismatic Spring, Wyoming, USA

Grand Prismatic Spring, Wyoming, USA

If you're looking for a bit of artistic inspiration, you'll find it at the Grand Prismatic Spring. Sitting in the Midway Geyser Basin, this is the largest hot spring in the United States, approximately 250 by 300 feet in size and around 160-feet deep. But it's Grand Prisimatic's rainbow waters that really make it fascinating: While the center of the pool's deep cerulean hue is pretty characteristic, the deep reds, bright yellows and fiery oranges encircling the edges are not.

These colors are caused by pigmented thermophilic bacteria that thrive on the rich minerals produced by the geothermic activity. The color of the bacteria is determined by the temperature of the water — the center of the spring is too hot to support life — which is then reflected when light hits the organisms.