Yellowstone became the 'world's first national park' 151 years ago: See bygone photos of iconic landscape

The “first national park” was born 151 years ago, on March 1, 1872, when President Ulysses S. Grant signed into law the Yellowstone National Park Protection Act. Yellowstone National Park is one of the largest and best-known parks in the country, covering nearly 3,500 square miles in Wyoming, …