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Yellowstone's vibrant hot springs

Mark Ralston / AFP - Getty Images

View of the 'Morning Glory' hot spring with it's unique colors caused by brown, orange and yellow algae-like bacteria that thrive in the cooling water, turning the vivid aqua-blue to a murkier greenish brown, in Yellowstone National Park, Wyoming, on Thursday, June 2. Yellowstone National Park was established by the U.S. Congress and signed into law by President Grant on March 1, 1872. The park is located primarily in the U.S. state of Wyoming, though it also extends into Montana and Idaho and was the first national park in the world. It is known for its wildlife and its many geothermal features, especially the Old Faithful Geyser.

Mark Ralston / AFP - Getty Images

View of the 'Grand Prismatic' hot spring with it's unique colors caused by brown, orange and yellow algae-like bacteria called Thermophiles, that thrive in the cooling water turning the vivid aqua-blue to a murkier greenish brown, in Yellowstone National Park on Thursday.

Mark Ralston / AFP - Getty Images

Tourists walk beside a hot spring and the partially frozen Yellowstone Lake at the West Thumb Geyser Basin in Yellowstone National Park on Thursday.

Check out more natural wonders in our national parks slideshow.