The Grand Prismatic Spring is the largest hot spring in the United States. It's vivid colors are created by mats of bacteria that live along the spring's edge. With a discharge of 560 gallons of 160 degree Fahrenheit water each minute, and a size of 250 x 300 feet, it is, indeed, grand. A view from above shows the enormity, and beauty, that the ground view just can't capture.
Here are some images of the Grand Prismatic Spring: