West Yellowstone

Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States and the third largest in the world, measuring 90 meters in diameter and up to 50 meters deep. Its vividly colored rings — blue in the center graduating through teal, green, yellow, and orange to a deep red at the edges — are caused by heat-loving bacteria (thermophiles) that form pigmented mats at different temperatures. The spring is best appreciated from an overlook trail that provides the aerial perspective needed to see its full rainbow.

Old Faithful Geyser is a notable point of interest, offering visitors an opportunity to experience the distinctive character and appeal of this destination. Whether for its natural beauty, cultural significance, or unique atmosphere, it provides a rewarding experience as part of a broader exploration of the area.

Yellowstone National Park is the world's first national park, established in 1872, and sits atop one of the planet's largest volcanic calderas. It is home to more geothermal features than anywhere else on Earth, including Old Faithful geyser, the Grand Prismatic Spring, and thousands of hot springs. The park's vast wilderness supports wolves, grizzly bears, bison, and elk, making it a premier wildlife-watching destination.