The largest hot spring in the United States and the third-largest in the world, Grand Prismatic Spring is a must-see while visiting Yellowstone National Park. The spring was given its name by the Hayden Expedition in 1871, when artist Thomas Moran captured the vibrant tones in watercolors. His paintings would later come under scrutiny, with another expedition returning in 1878 to verify the colors. Turns out Moran wasn’t exaggerating.
11 Unusual National Parks and Monuments 11 Photos
Ultimate Travel: Legends of the Park 9 Photos
My 10 Favorite National Parks 10 Photos