Bradly J. Boner | Photography

Grand Prismatic Spring at the Midway Geyser Basin, Yellowstone National Park

Tourists walk along the boardwalks near the Grand Prismatic Spring at the Midway Geyser Basin recently in Yellowstone National Park. With a diameter of 370 feet, Grand Prismatic is the largest hot spring in the United States and the third largest in the world.

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Tourists walk along the boardwalks near the Grand Prismatic Spring at the Midway Geyser Basin recently in Yellowstone National Park. With a diameter of 370 feet, Grand Prismatic is the largest hot spring in the United States and the third largest in the world.