Yellowstone National Park, known for erupting geysers like Old Faithful, is home to one of earth's largest volcanic systems, with the capacity to wreak havoc on an entire continent — and that so ...

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.

The Yellowstone Volcano Observatory says these explosions “happen almost annually” in Yellowstone Park. The park is even home to the largest-known hydrothermal explosion crater on Earth: Mary Bay.