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In 1872, President Ulysses S Grant and the 42nd US Congress enacted a law making Yellowstone the first national park, not just in America, but the entire world.
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At over 8,900km2 (2.2 million acres), the park is huge, stretching across Wyoming, Montana and Idaho. It's home to all sorts of wildlife including bears, wolves and bison.
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The park is well known for its geothermal features, including its supervolcano and the world-famous geyser Old Faithful, which has over 1,000,000 recorded eruptions.
What would cause Yellowstone to erupt?
There's a lot we don't know about supervolcano eruptions; there hasn't been one in recorded history. So,