Fred Hagstrora rides a bicycle into the crystal clear waters off the dock at Fort Jefferson in the Dry Tortugas on Aug. 14, 1981.
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Rangers range at Everglades National Park on Nov. 29, 1948.
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Everglades National Park Ranger Edward Meadows patrols the Shark Valley area with Rocky the Raccoon on Jan. 29, 1972.
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Everglades National Park Ranger Charles Bayer lets dry earth sift through his fingers as he kneels on the cracked ground, where there normally is from 12 to 18 inches of water, in the upper part of the park on April 27, 1971.
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Park policeman P.E. Sher helps Stan Stephan and Barbara Anthony get their kites airborne on the Washington Monument grounds as thousands turned out after repeal of a 19th-century anti-kite law on May 25, 1970.
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Yosemite National Park visitors take advantage of the slopes and ski-touring trails on Feb. 4, 1991.
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William McKinley Osceola (center), a Seminole Indian, presents President Harry Truman with a shirt worn by members of his tribe and a Seminole flag at the formal dedication of Everglades National Park in Everglades City, Fla., on Dec. 7, 1947.
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Visitors take a raft trip through Teton National Park on May 25, 1976.
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Surfcaster Ince Sclafani of Brooklyn is determined to latch onto one of the monster bluefish and striped bass that have been taken from the surf at the T. Tilden section of Gateway National Park in Queens, NY, on Sept. 13, 1992.
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Jamaica Bay Wildlife Refuge’s chief ranger, Don Riepe, wields a net on Sept. 7, 1992, as the annual butterfly census is taken in the greater New York area by the National Park Service at Gateway National Park sites in Queens, Brooklyn, Staten Island and Sandy Hook, NJ.
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Hikers on May 14, 1975, show why the sky-punching peaks, sweeps of lakes and meadows of Montana’s Glacier National Park are known as The Crown of the Continent.
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Ski jumper Ted Rex gets a workout in California’s Lassen Volcanic National Park on Feb. 23, 1933.
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New York Gov. Nelson Rockefeller waves during a horseback ride through Glacier National Park on July 27, 1960.
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On Nov. 25, 1968, first lady Lady Bird Johnson dedicates 58,000-acre Redwood National Park north of Eureka, Calif.
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Visitors sit atop a redwood in Sequoia National Park while a truck passes through the tunnel carved through its trunk after the 275-foot giant fell across the road in 1937, in a scene from “America’s Wonderlands,” the national parks’ first National Geographic Society special, on Oct. 23, 1968.
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A carving of Paul Bunyan and his blue ox, Babe — said to be the world’s largest carving from a single piece of wood — takes shape under the ax and chisel of sculptor Carrol Barnes in the foothills leading to Sequoia National Park near Vasalia, Calif., on May 18, 1942.
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Most merely endure Death Valley in the summer, but some thrive in its heat. Among the latter was Sonny Brunet, 48, a maintenance supervisor for Death Valley National Park, who hiked a mile or two in the scorching heat every day, including here on Aug. 3, 1981. His wife hated Death Valley summers and rarely ventured outside.
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President Warren G. Harding rides through Zion National Park, with the famous Angels Landing in the background, on July 4, 1923.
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An airliner from Union Air Terminal passes the towering peaks of the Grand Tetons in Wyoming on the inaugural flight of the new direct service of Western Air Express from Los Angeles to Yellowstone National Park on Aug. 7, 1940.
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A mother bear ignores cars in Yellowstone National Park while her cubs consider looking for a handout on Sept. 9, 1968.
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Half Dome, the famous rock giant, looms nearly 5,000 feet over Yosemite Valley on June 13, 1934.
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President Theodore Roosevelt stands in front of Bridal Veil Falls at Yosemite National Park.
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A member of the Medicine Ball Caravan relaxes in Grand Canyon National Park on Aug. 20, 1971.
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National Park Service divers Irving Tubbs (right) and Barbara Samora splash water on a pilot whale that grounded itself in a marsh near First Encounter Beach in Eastham, Mass., on Dec. 4, 1986.
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Tourists stop to have lunch at one of the camping and picnic sites on the shore of Spirit Lake in Washington state’s Gifford Pinchot National Park on June 5, 1953.
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Chinook Pass on the edge of Mount Rainier National Park hosts shovel races on June 11, 1941.
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National park police take their mounts for a morning workout along the beach at Breezy Point in Queens on Feb. 10, 1991.
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Old Faithful blows off some steam as President Franklin Roosevelt tours Yellowstone National Park on Sept. 30, 1937.
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