The Midway Geyser Basin's Grand Prismatic Spring is the largest hot spring in Yellowstone and one of the largest hot springs in the world. Measuring approximately 370 feet in size and around 121 ...

Yellowstone National Park holds some of the most stunning natural wonders in the United States. Located just outside Jackson ...

While a one-day visit can showcase the highlights, a 3-day Yellowstone itinerary is ideal for most travelers, encapsulating top sights like Old Faithful, Grand Prismatic Spring, and the Grand ...

Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in North America and the third-largest in the ...

The Grand Prismatic Spring is the most recognizable thermal feature of Yellowstone National Park, but some of its most fascinating features are invisible to the naked eye. Underwater exists a ...

The beating heart of Yellowstone National Park is without a doubt the Grand Prismatic Spring—the largest hot spring in the U.S. Its colorful bands are the product of hardy bacteria and algae ...

According to the Yellowstone Volcano Observatory, it’s probable that this new hydrothermal feature is connected to activity ...

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...