Buffalo Soldiers from Company H, 24th Infantry Regiment, 1899. America's Buffalo Soldiers (African-American regiments of the U.S. Army formed in 1866) stationed eight troops of the 9th Cavalry Regiment and one company of the 24th Infantry Regiment in California to serve as some of the country's first National Park Rangers. #

In 1944, convalescent sailors rest in Ward A at the Yosemite Naval Convalescent Hospital, located in Yosemite National Park, California, on September 17. The Ahwahnee Hotel was converted to a hospital during World War II. #

Some of the patients of the Yosemite National Park Naval Convalescent Hospital try their hand at trout fishing in the Merced River which runs through Yosemite Valley, California, on August 12, 1943. Seated on bank, left, is Joseph P. Clements, PFC in the marines. At right is George Whisman, ship's cook 2nd class of Portland, Oregon. In left background the North Dome rises 7,531 feet. At right, Half Dome rises 8,852 feet. #

Patients from the Yosemite Naval Convalescent Hospital gaze at a tree on Sentinel Dome at Yosemite National Park, on July 24, 1944. The sailors are (left to right) Rockwell Jackson, Eugene Arata, John Rohn and R.T. Berlin. #

Bicycles are a favorite means of getting to key locations on the Yosemite Valley Floor in Yosemite National Park, on July 8, 1952. This small group is shown at Mirror Lake, a favorite spot with visitors. #

Deluxe camping is done by trailer travelers who bring their rolling homes to Yosemite Valley, Yosemite National Park in California, on July 8, 1952. The picture shows Mr. and Mrs. Eric C. Peterson, of San Fernando, California. #

At Glacier Point, 3,254 feet above the floor of Yosemite Valley and 7,250 feet above sea level, numerous peaks of the main Sierra Nevada range can be seen, July 8, 1952. #

The setting sun hits Horsetail Fall at just the right angle to light it up as if it's on fire, in Yosemite Park, in February of 2008. This natural phenomena occurs for just two weeks in February and is reminiscent of an old firefall of burning embers that park employees pushed over Glacier Point to entertain guests until 1968. #

Sky & Telescope Senior Editor Roger Sinnott sets up his 5x7 view camera toward the Clark Mountain Range on September 15, 2005, at Glacier Point in Yosemite National Park. Astronomers pinned down the exact time and date that photographer Ansel Adams snapped his ethereal picture "Autumn Moon," and determined that the sun, moon and mountains were to align in the same positions at 7:03 p.m. as they did more than 55 years ago when Adams photographed the scene. "Autumn Moon: the High Sierra From Glacier Point" depicts a gauzy moon hanging in the darkening sky above the jagged peaks of the Clark Range. Sinnott believes the spot he placed his camera to be the same spot used by Adams. #

Two juvenile Great Gray Owls sit on a tree branch in Yosemite National Park, on July of 2012. The unique Great Gray Owls of Yosemite National Park, left to evolve after glacial ice separated them from their plentiful Canadian brethren 30 millennia ago, are both a mystery and concern to the scientists charged with protecting them. #

A bobcat, photographed during a group photo outing to Yosemite National Park in February of 2011. Original here. #

Flames from the Rim Fire consume trees on August 25, 2013 near Groveland, California. Although it is currently 92% contained, the Rim Fire continues to burn in some areas, after scorching more than 250,000 acres, including parts of backcountry Yosemite National Park. #