Scientists at Yellowstone National Park have uncovered a large, underground magma cap that is likely crucial to containing one of Earth's largest volcanic systems. Hidden 2.4 miles (3.8km) beneath Yellowstone's northeast caldera, the cap acts as a lid for the intense heat and pressure below it, which could otherwise cause large-scale eruptions.

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.