Grand Prismatic Spring: This multicolored pool is one of thousands of hot springs and geysers in Yellowstone Park.

Since the late 19th century unusual natural features, areas of wilderness and wildlife have been protected by the establishment of national parks and nature reserves
Volcanic activity has created some of the most colorful and extraordinary landscapes, including hot springs, colored lakes and a soft volcanic rock that is easily eroded and shaped by the forces of water or wind.
Many landscapes contain a kaleidoscope of colors – seen in rocks, lakes and soil – caused by the minerals present or the sediment they contain, or by the effects of heat or burial beneath the Earth’s surface...