A pair of tourists decided they wanted a closer look at Yellowstone ... spring, wandering off the boardwalk and ignoring warning signs to stand right on the colorful bacterial mats at Grand Prismatic.

The Instagram account is dedicated to “tourons,” a combination of tourist and moron ... of a boardwalk at The Grand Prismatic Spring, the largest hot spring at Yellowstone National Park.

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 ...

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.