Yellowstone is centered on a active supervolcano which last erupted over 600 thousand years ago. But due to its activity, there are many underground cavities in which water is heated and pushed to the surface. This can lead to four different types of observable phenomena, all of which we saw during our stay in the park. The top picture is of Sarah sniffing the sulfur-rich mud pot. The next one down shows the two of us in front of a hot spring, colored by minerals which are brought up with the water. Next one down is me getting heated up by a steam vent. And, on the bottom you can see Sarah with the most famous geyser in the world: Old Faithful, which erupted right on schedule at 2:54.
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