Photos: National Park Service turns 100
On Aug. 25, 1916, President Woodrow Wilson signed an act establishing the National Park Service within the Department of the Interior. Many sites were designated national parks prior to this date, including Yellowstone - which became the world's first national park in 1872 - as well as Sequoia and Yosemite.
Yosemite National Park, Calif.
- Tammy Webber
- Updated
This Oct. 2, 2013, file photo, shows a view seen on the way to Glacier Point trail in the Yosemite National Park, Calif. Many of the country's most prominent national parks, including Grand Canyon, Yellowstone and Zion, set new visitation records in 2015. The National Park Service celebrates its 100th birthday in 2016 and has been urging Americans to rediscover the country's scenic wonders or find new parks to visit through marketing campaigns. (AP Photo/Tammy Webber, File)
Yosemite National Park, Calif.
- Ben Margot
- Updated
This Jan. 14, 2015, file photo, shows El Capitan in Yosemite National Park, Calif. Many of the country's most prominent national parks, including Grand Canyon, Yellowstone and Zion, set new visitation records in 2015. The National Park Service celebrates its 100th birthday in 2016 and has been urging Americans to rediscover the country's scenic wonders or find new parks to visit through marketing campaigns. (AP Photo/Ben Margot, File)
Glacier National Park, Mont.
- RAY OZMAN
- Updated
With the peaks of Glacier National Park towering in the background, the Many Glacier Hotel, once dubbed "The Jewel of the Rockies" but now often referred to as "The Monster," stands Thursday Sept. 9, 1999, as a reminder of the opulence once offered to visitors who stayed at the park's hotels in the early part of the century. (AP Photo/Ray Ozman)
Yellowstone National Park in Wyoming
- KEVORK DJANSEZIAN
- Updated
Shadows on Porcelain Basin show visitors lined up on the boardwalk as they study the green Cyanidium algae, which grows in the 125-degree Fahrenheit water in the basin, near the Whirligig geyser pool inside Yellowstone National Park late Thursday afternoon, Aug. 14, 1997, in Wyoming. (AP Photo/Kevork Djansezian)
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Yosemite National Park, Calif.
- Tammy Webber
This Oct. 2, 2013, file photo, shows a view seen on the way to Glacier Point trail in the Yosemite National Park, Calif. Many of the country's most prominent national parks, including Grand Canyon, Yellowstone and Zion, set new visitation records in 2015. The National Park Service celebrates its 100th birthday in 2016 and has been urging Americans to rediscover the country's scenic wonders or find new parks to visit through marketing campaigns. (AP Photo/Tammy Webber, File)

Yosemite National Park, Calif.
- Ben Margot
This Jan. 14, 2015, file photo, shows El Capitan in Yosemite National Park, Calif. Many of the country's most prominent national parks, including Grand Canyon, Yellowstone and Zion, set new visitation records in 2015. The National Park Service celebrates its 100th birthday in 2016 and has been urging Americans to rediscover the country's scenic wonders or find new parks to visit through marketing campaigns. (AP Photo/Ben Margot, File)

Glacier National Park, Mont.
- RAY OZMAN
With the peaks of Glacier National Park towering in the background, the Many Glacier Hotel, once dubbed "The Jewel of the Rockies" but now often referred to as "The Monster," stands Thursday Sept. 9, 1999, as a reminder of the opulence once offered to visitors who stayed at the park's hotels in the early part of the century. (AP Photo/Ray Ozman)

Sequoia National Park, in Calif.
- Rich Pedroncelli
In this photo taken Friday Sept. 11, 2015, visitors explore the Tunnel Log, a passage cut through a Giant Sequoia tree that fell in 1937, at Sequoia National Park, near Visalia, Calif. (AP Photo/Rich Pedroncelli)

Yellowstone National Park in Wyoming
- KEVORK DJANSEZIAN
Shadows on Porcelain Basin show visitors lined up on the boardwalk as they study the green Cyanidium algae, which grows in the 125-degree Fahrenheit water in the basin, near the Whirligig geyser pool inside Yellowstone National Park late Thursday afternoon, Aug. 14, 1997, in Wyoming. (AP Photo/Kevork Djansezian)
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