Yosemite National Park, in California's Sierra Nevada mountain range, was one of the nation's first wilderness parks, created in 1890. It has granite cliffs towering over deep valleys, spectacular waterfalls and ancient giant sequoia trees. It also holds a special place in African-American history.

As an interpretive specialist at Yosemite, Ranger Shelton Johnson tells visitors about the history of the park. While researching Yosemite's archives, he learned that for three years, around the turn of the twentieth century, black U.S. Army regiments patrolled the park.