Ever been mesmerized by the swirling colors of Grand Prismatic Spring and wondered what fuels that otherworldly boil? It ...

Underneath Yellowstone National Park, magma bubbles and flows. But exactly how close it is to the surface has long been a ...

Geoscientists have discovered a magma cap at Yellowstone National Park that is likely playing a critical role in preventing a ...

Access to the Grand Prismatic Spring is included in Yellowstone's seven-day pass ($35) and there are no set hours of operation. Park rangers suggest caution around the hot springs by staying on ...

A magma cap that is likely playing a critical role in preventing a huge volcanic eruption has been found at Yellowstone ...

This Yellowstone National Park one day itinerary will show you all the highlights that make it the most popular National Park in the US. From Old Faithful to the Grand Prismatic Spring and seeing ...

How the Grand Prismatic Spring Gets Its Kaleidoscopic Colors The beating heart of Yellowstone National Park is without a doubt the Grand Prismatic Spring—the largest hot spring in the U.S.

Yellowstone National Park is a place where steam rises from ... (which erupts roughly every 90 minutes) to the colorful Grand Prismatic Spring, adding in the abundance of opportunities for ...

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park ... colors of Grand Prismatic Spring come from ...