Yellowstone National Park, a 2.2-million acre preserve of geological marvels and wildlife, became America's first national park on this day in history, March 1, 1872.

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.

Inspired by early reporting of marvels such as the Grand Canyon of Yellowstone River, seen here, the U.S. Congress established Yellowstone as America’s first national park in 1872.

Yellowstone National Park was established in 1872 as the world’s first national park. The park is celebrating its 150th anniversary this year. Most of Yellowstone is located in Wyoming, but ...

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, an almost mystical 2.2-million acre wonderland of dynamic hydrothermal activity, breathtaking scenery and spectacular wildlife, was established on this day in history ...

Yellowstone National Park, an almost mystical 2.2-million acre wonderland of dynamic hydrothermal activity, breathtaking scenery and spectacular wildlife, was established on this day in history ...

Yellowstone National Park, an almost mystical 2.2-million acre wonderland of dynamic hydrothermal activity, breathtaking scenery and spectacular wildlife, was established on this day in history ...