Scientists have discovered a giant 'magma cap' under Yellowstone National Park. The cap is likely playing a critical role in preventing a massive volcanic eruption.

Located within parts of Wyoming, Montana, and Idaho, Yellowstone National Park truly deserves the honor of being designated America’s (and the world’s) first national park. Within it’s 2.2 million acres is the world’s greatest collection of geothermal displays and such a great diversity of wildlife that the park is nicknamed “America’s Serengeti.