How the Grand Prismatic Spring Gets Its Kaleidoscopic Colors The beating heart of Yellowstone National Park is without a doubt the Grand Prismatic Spring—the largest hot spring in the U.S.

These colors are caused by thermophilic bacteria ... Due to the steam, some visitors might want to take a photo of the Grand Prismatic Spring from above to capture its brilliant color.

The tall pillars of the Cary Arts Center are lit with a prismatic glow, and the rainbow colors spiral around the skywalk over Downtown Park. The amphitheater at the park has rainbow lights shining ...