Silex Spring at the Fountain Pots in Yellowstone has the most incredible colors. From the aqua to blue in the depths of the hot spring to the bright orange bacteria thriving in the hot water, the colors are amazing.
The run off from Grand Prismatic Spring in Yellowstone NP is quite colorful thanks to the bacteria that somehow thrive in the scalding water. Colors of the bacteria vary according to the water temperature.
The Spirit Warrior sculpture at Little Bighorn, Montana commemorates the Indians protecting their tribes and families.