Old Faithful • Earth.com Old Faithful

What is it about Yellowstone that attracts some four million visitors every year? For many, it’s about the almost guaranteed opportunity to watch a geyser in action. Because the park is home to Old Faithful, an impressive geothermal feature that erupts approximately 20 times every day. And, unusually, park staff are typically able to predict when it will erupt. Photo credit: Kelly Cheng Travel Photography / Getty Images

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