Steamy

Mammoth Hot Spring. The hot springs are surrounded by colorful thermophile. [Click image to enlarge]

Thermal

Mammoth Hot Spring. The hot springs are surrounded by colorful thermophile. [Click image to enlarge]

Grande

This is the Grand Geyser. Really spectacular. [Click image to enlarge]

Rainbow

This is the Riverside Geyser. We were lucky to see the rainbow when the wind was right. [Click image to enlarge]

Cone

A cone-shape geyser in the Yellowstone Lake, at West Thumb. [Click image to enlarge]

Hot & Cold

A beautiful contrast between the hot spring and the cold water in Yellowstone Lake. [Click image to enlarge]