The primary draw for millions of visitors to Yellowstone National Park is its unparalleled collection of hydrothermal features, most notably Old Faithful Geyser. As the world's first national park, it sits atop a volcanic hotspot, containing more than 10,000 geothermal wonders, including bubbling mud pots, brilliant hot springs like the Grand Prismatic Spring, and over 500 active geysers. Beyond the steam and sulfur, the park is equally famous for its "American Serengeti" status, offering some of the best wildlife viewing in the country. Tourists flock to the Lamar and Hayden Valleys to see grizzly bears, gray wolves, and massive herds of wild bison. The combination of these unique geological "alienscapes" and the raw, untamed nature of the Rocky Mountains creates a "bucket list" destination that provides a sensory experience found nowhere else on Earth.