Walking into Norris Geyser Basin is like visiting another planet. The geothermal features in this basin are always changing, highly acidic, and have the highest concentration of silica in Yellowstone.
The Pinwheel Geyser is in the distance, with runoff from Whirligig Geyser giving a colorful display from the thermophiles.
The unusual Blue Mud Steam Vent.
We all liked the Green Dragon Spring.
Puff 'n Stuff Geyser.
Steamboat Geyser is the world's tallest active geyser with water shooting 300 feet into the air for anywhere from 3 to 40 minutes, but full eruptions are unpredictable. It hasn't had a major eruption since 2005.
Emerald Spring is 27 feet deep and the temperature is almost boiling.