Yellowstone National Park is a great place to visit if you're ever in Wyoming, Montana, or Idaho!
I have been to Yellowstone a few times.  Very interesting geology there.  Have you ever heard of the super-caldera there?
Are you talking about the Yellowstone Caldera? The volcanic caldera and supervolcano in the parl?
Yes, that is it!  Do you know anything about it?
Well, like the rest of the park, the caldera is located in the northwest corner of Wyoming!
Any idea on how often it erupts, or the last time it erupted?
Huckleberry Ridge Tuff); the Mesa Falls eruption 1.3 million years ago (which created the Henry's Fork Caldera and the Mesa Falls Tuff); and the Lava Creek eruption approximately 630,000 years ago (which created the Yellowstone Caldera and the Lava Creek Tuff).
Volcanism at Yellowstone.
Volcanism at Yellowstone is relatively recent, with calderas that were created during large eruptions that took place 2.1 million, 1.3 million, and 630,000 years ago. The calderas lie over a hotspot under the Yellowstone Plateau where light and hot magma
Yellowstone Caldera
The Yellowstone Caldera is a volcanic caldera and supervolcano in Yellowstone National Park in the Western United States, sometimes referred to as the Yellowstone Supervolcano. The caldera and most of the park are located in the northwest corner of Wyoming. The major features of the caldera measure about 34 by 45 miles (55 by 72 km). 
The caldera formed during the last of three supereruptions over the past 2.1 million years: the Huckleberry Ridge eruption 2.1 million years ago (which created the Island Park Caldera and the