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The Geothermal Prism — Fotopedia
This is Yellowstone at sunset. It got rather chilly about this time but the warm steam from the geothermals kept us warm.
Wikipedia Article

The Yellowstone Caldera is the volcanic caldera located in Yellowstone National Park in the United States, sometimes referred to as the Yellowstone Supervolcano. The caldera is located in the northwest corner of Wyoming, in which the vast majority of the park is contained. The major features of the caldera measure about 34 by 45 miles (55 by 72 km).

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