Feature. Portrait of Yosemite National Park Ranger Mark Fincher alone w. Mountain climbing gear in front of peak.
Park ranger Dustin Eads explained to a group of tourists from China who planed their vacation 6 months in advance where they were and were not...
An unidentified National Park Service worker cleans the statue of Abraham Lincoln 25 October as part of the annual cleaning of the Lincoln Memorial...
Matt Lippy prepares of descend down a cliff as the National Park Service trains for technical rescue climbing on the Maryland Heights rockface near...
San Francisco, UNITED STATES: A National Park Service ranger walks down "Broadway" in the main cell block on Alcatraz Island, 14 June 2007 in San...
National Park Service ranger looks towards the Statue of Liberty which, remains closed to the public six weeks after Hurricane Sandy on December 13,...
National Park Service park ranger Eugene Kuziw, originally from New York, stands in the crown of the Statue of Liberty on May 8, 2009 in New York...
Everyone was invited to help the rangers at Prince William Forest celebrate Founders Day, the 85th anniversary of the founding of the National Park...
An unidentified National Park Law Enforcement Ranger stands guard at Independence Hall March 19, 2003 in Philadelphia, Pennsylvania. The National...
Friday, May 8, 1998 -- National Park Service supervisor Paul Heartel on a section of the Loop Road in Acadia National Park that road crews are...
National Park Service Ranger gives a guided tour of the Martin Luther King, Jr. Memorial, January 20, 2014 in Washington, DC. Americans marked the...
National Park Service workers remove tarps and debris from the site of the Occupy DC encampment February 5, 2012 in McPherson Square in Washington,...
National Park Service Park Ranger Christopher Chang rings the bell of the U.S.S. Arizona during a memorial service for the 73rd anniversary of the...
National Park Service ranger Betty Reid Soskin poses for a portrait at the Rosie the Riveter/World War II Home Front National Historical Park on...
National Park Service rangers salute during the National Anthem on June 30, 2013 in Gettysburg, Pennsylvania. Hundreds of people gathered for the...
National Park Service ranger Betty Reid Soskin wears a patch on her uniform while working at the Rosie the Riveter/World War II Home Front National...