9. Yellowstone National Park
It all began here in 1872, when US Congress deemed 2.2 million acres of thermal features, forests, mountains and river valleys – home to countless varieties of wildlife - as the world’s first national park. Thanks to these conservation efforts, Yellowstone remains one of the last, nearly-intact ecosystems with the largest concentration of geysers in the world. And while Yellowstone’s human history goes back 11,000 years, this area continues to offer up transformative experiences, positively impacting each traveler as they explore inside the park’s gates.