We finished our day in Yellowstone by visiting the Fountain Mud Pots. I thought they might be lesser versions of the Midway Geysers, but they were their own thing. Bubbling mud? You just gotta stop the car and see it.
Yes, it does smell. A lot.
The Fountain Geyser was the one that really made me feel like I was walking around on a volcano. About to blow. At any minute.
High on those sulfur fumes.