Yellowstone sits on top of one of the world 's largest volcanoes . The volcano is about as old and massive as our own planet, but it has a much smaller volume than Earth does. No volcanic eruption is expected for 1,000 years or more .
Yellowstone sits on top of one of the world 's largest volcanoes . Extreme heat from the volcano 's thermal areas damaged the popular road . No volcanic eruption is expected for 1,000 years or more .