Do you know where the largest "active" super volcano is located in the continental United States? It might surprise you to know it is located in Yellowstone National Park. If you walk around the park you might not notice it though you would be aware of its presence all around you seen in the hot springs and mud pits throughout the park. So why would you not notice it? It's so big that you simply cannot see it. The Yellowstone super volcano is so large that its caldera can only be seen from space. Yellowstone National Park is not just the location of the volcano, it is the volcano, and if it erupts we will say good-bye to the earth as we know it.