Yellowstone turns 150. Here’s a peek into the national park’s history

Visitors are seen at Grand Prismatic Spring in Yellowstone National Park, Wyo., last year.

Yellowstone became the first national park in the U.S. on March 1, 1872, and it helped usher in the broader national park movement. The park stretches into Wyoming, Montana, and Idaho.

(Image credit: Iris Samuels/AP)

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