Hamilton Pool Natural Preserve, Austin, Texas

Yellowstone National Park USA

View of the “Sunset Lake” hot spring with it is an exclusive colors caused by brown, orange and yellow algae-like bacteria called Thermophiles, that thrive in the cooling water turning the vivid aqua-blues to a murkier greenish brown, in the Yellowstone National Park, Wyoming on June 1, 2011. 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 United States of Wyoming however it also extends into Montana and Idaho and was the first national park in the world. It is famous for its wildlife and many geothermal features, particularly the Old Faithful Geyser.