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  • The National Park Service celebrates it's centennial, Aug. 25, 2016. U.S. President Woodrow Wilson created the National Parks Service 100 years ago "to conserve the scenery and the natural and historic objects and the wild life therein and to provide for the enjoyment of the same." Over 300 million people visited national parkland in 2015. Here, the sun sets as Mount McKinley casts its reflection on Reflection Pond at the west end of Denali National Park Road, in Denali Park, Alaska. In August 2015, the government changed the name of North America's tallest peak from Mount McKinley to Denali.
    Al Grillo/AP Photo
  • Erupting Kilauea Volcano on the main island of Hawaii devastates a thick rain forest, spewing molten rock up to 20 feet in the air, in Hawaii Volcanoes National Park.
    Bettmann Archive/Getty Images
  • The sun rises over Crater Lake, Oregon, in Crater Lake National Park. Crater Lake lies in the caldera of an ancient volcano called Mount Mazama that collapsed 7,700 years ago, according the the National Parks Service.
    Marc Adamus/The Register-Guard via AP Photo
  • A great egret sits on top of a dead tree in Florida's Everglades National Park, near South Bay, Florida, as a thunderstorm moves across the area. Everglades National Park protects an unparalleled landscape that provides important habitat for numerous rare and endangered species like the manatee, the American crocodile, and the elusive Florida panther, according to the National Parks Service.
    J. Pat Carter/AP Photo
  • A cloud hovers over Mount Rainier at sunset in a view from Klapatche Park Camp, at Mount Rainier National Park, Washington. An active volcano, Mount Rainier is the most glaciated peak in the contiguous United States, according to the National Parks Service.
    Drew Perine/The News Tribune via AP Photo
  • The Frozen Niagara, a flowstone, or travertine, formation inside Mammoth Cave, in Mammoth Cave National Park.
    NPS
  • Spadefish are seen in the Biscayne National Park, which encompasses coral reefs, islands and shoreline mangrove forest in the northern Florida Keys.
    NPS
  • Hikers look up at a fast-moving storm as it makes its way through Zion National Park outside of Springdale, Utah. Both Zion and Bryce were formed millions of years ago when the earth's crust violently heaved, leaving behind stunning, unique arrays of rock formations.
    Sandy Huffaker/AP Photo
  • A moose eats vegetation from the bottom of Fishercap Lake at Glacier National Park in Montana, on Aug. 14, 2016.
    Paul Hennessy/Polaris
  • Autumn fog in the Middlesboro Basin in the Cumberland Gap National Historical Park in Kentucky.
    Harold Jerrell/NPS
  • Canoers canoeing down the Mariscal Canyon in Big Bend National Park in Texas.
    NPS Photo/Jennette Jurado
  • Bryce Canyon National Park is known for its crimson-colored hoodoos, or spire-shaped rock formations in Utah.
    NPS
  • Garnet Canyon is located in Grand Teton National Park in Wyo.
    NPS
  • Shown here are silverswords (Ahinahina) along 'Sliding Sands Trail' in Haleakala National Park, Maui, Hawaii.
    A. Rulison/NPS Photo
  • The 'Ruins of Karnak' inside Mammoth Cave along the Historic tour route, taken from the tower at Mammoth Dome in Mammoth Cave National Park, Ky.
    NPS
  • Pictured here are scenic views of the Blue Mesa Badlands in Petrified Forest National Park, Ariz.
    NPS
  • Dark Hollow Falls is the shortest trail down to a waterfall in Shenandoah National Park, Va.
    NPS
  • This photo was posted to the Instagram account of the Yellowstone National Park on Oct 28, 2015 with text "Castle Geyser erupts roughly every 14 hours, with water frequently reaching 75 feet."
    yellowstonenps/Instagram
  • This photo was posted to the Instagram account of the Yosemite National Park on Oct. 26, 2015 with text "Half Dome put on another beautiful show basking in the warm light of alpenglow."
    yosemitenps/Instagram
  • This photo was posted to the Instagram account of the Denali National Park on Oct. 12, 2015 with the text "The things that happen above our park are moments made for eternity."
    denalinps/Instagram
  • This photo was posted to the Flickr account of Death Valley National Park on July 25, 2009 with text "Salt Creek 1."
    NPS/Flickr
  • This photo was posted to the Instagram account of the Great Smoky Mountains on June 19, 2015 with text "Getting up early has its advantages!"
    greatsmokynps/Instagram
  • This photo was posted to the Instagram account of the Everglades National Park on April 17, 2015 with the text "The ecosystem seen from above is truly a marvelous experience."
    NPS/Instagram
  • This photo was posted to the Flickr account of Joshua Tree National Park on May 19, 2015 with text "Night Sky."
    NPS/Brad Sutton
  • This image was posted to the US Interior's Instagram account on Aug. 19, 2015 with the text, "Clear skies and fireweed in the high country - both are sure signs of mid-summer at #Olympic National Park in #Washington. #NationalPark Service photo from @olympicnationalpark."
    @USInterior/Instagram
  • This image was posted to the Department of the Interior's Instagram account on Aug. 18, 2015 with the text, "Summer storms make for some amazing pics. This photo was taken last week as a thunderstorm passed through the sage steppe on #Seedskadee National #WildlifeRefuge in Wyoming. The clouds thinned for just a few minutes at #sunset, allowing the "magic" light to filter through the clouds as a bolt of #lightning struck at the same time. Photo by Tom Koerner, @USFWS."
    @USInterior/Instagram
  • This image was posted to the U.S. Interior's Instagram account on July 31, 2015 with the text, "A gorgeous shot of the #fullmoon at City of Rocks National Reserve in #Idaho This photo of the moon was taken this morning as it was setting behind @cityofrocks's Graham Creek Canyon. Tonight's full moon is called the blue moon -- a rare occurrence when two full moons take place in a month. Tonight's #bluemoon will be the first since August 2012 and we will not see another until January of 2018. Hope you get a chance to see it!"
    @USInterior/Instagram
  • This image was posted to the Department of the Interior's Instagram account on Aug. 2, 2015 with the text, "Uncle Tom's Trail: The perfect place to catch your breath and take in the incredible views of Lower Falls of the Yellowstone River at #Yellowstone #NationalPark (@yellowstonenps). If you're lucky, you might even see a double #rainbow. Photo by Neal Herbert, National Park Service."
    @USInterior/Instagram
  • This photo was posted to the Instagram account of the Dept. of the Interior on July 23, 2015 with the text, "Summer sunsets at #Denali National Park in #Alaska are truly special. Kent Miller (@kent_miller) snapped this dream-like photo two days ago of a #moose walking along Reflection Pond. In the background, the top of Denali is illuminated by the setting sun at midnight. Photo by Kent Miller (@kent_miller), #NationalPark Service."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 20, 2015 with the caption, "Happy first day of spring! Now is the perfect time to start planning a visit to America's gorgeous public lands. Pictured here is a meadow of wildflowers at Mount Rainier National Park in Washington at sunset. Photo by Danny Seidman".
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 19, 2015 with the caption, "The journey through Zion National Park's The Subway is like no other. Without any trails, hiking The Subway requires route finding, rappelling and even swimming. Photo by Korey Taylor."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 15, 2015 with the caption, "Lake Clark National Park is a land of stunning beauty where volcanoes steam, salmon run, bears forage, craggy mountains reflect in shimmering turquoise lakes, and local people and culture still depend on the land and water of their home. Solitude is found around every bend in the river and shoulder of a mountain. Venture into the park to become part of the wilderness."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 20, 2015 with the caption, "Sunset at EvolutionLake at Kings Canyon National Park in California is truly beautiful. The last light of the day makes the mountains surrounding the lake glow - a phenomena that is known as alpenglow. Photo courtesy of Greg Owens"
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 27, 2015 with the caption, "MesaArch at Canyonlands National Park is one of the most photographed arches in southeast Utah. This location is especially popular at sunrise, when groups of photographers often lay in wait for the glow of sunrise on the bottom of the arch. Even with the crowds, it's an incredible experience."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 9, 2015 with the caption, "El Capitan makes its first appearance as an early morning fog burns off in the valley at Yosemite National Park in California. Photo courtesy of Michael Bonocore."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 14, 2015 with the caption, "Male mountain bluebird along Upper Beaver Meadows Road in Rocky Mountain National Park late this week. Photo by NPS/VIP Schonlau"
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on Nov. 20, 2014 with the caption, "Named one of the must-see places for 2015 by National Geographic Travel, the National Mall and Memorial Parks in Washington is full of rich history and natural beauty. Visit in March and April to see the park's iconic cherry blossoms at their peak."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 23, 2015 with the caption, "Discover Cedar Breaks National Monument in Utah. The monument is best known for its geologic amphitheater -- a brilliantly colored limestone coliseum that plunges a half-mile deep. Surrounding the canyon are lush meadows and one of the world's oldest trees, the bristle cone pine. Sunset photo by Bud Walley".
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 24, 2015 with the caption, "The scenic Handies Peak Wilderness Study Area in Colorado is known for its mountains, multi-colored rock formations, diverse vegetation and vast, open vistas. The area is home to Handies Peak, which rises 14,048 feet over the area -- plus 12 other peaks that are more than 13,000 feet, three major canyons, glacial cirques and three alpine lakes. This landscape makes Handies Peak WSA a perfect getaway for hiking, backpacking, camping, mountain climbing and photography. Photo by Bob Wick"
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 24, 2015 with the caption, "Stargazing is out of this world at Arches National Park in Utah. Photo of the Milky Way over one of the park's many rock formations by Manish Mamtani."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 25, 2015 with the caption, "Muir Woods National Monument is a remnant of ancient coast redwood forests that blanketed many northern #California coastal valleys before the 1800s. A short drive from San Francisco, Muir Woods is home to massive redwoods that are hundreds of years old. The tallest tree is more than 250 feet tall and over 14 feet wide. Photo courtesy of Duane Jurma"
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 25, 2015 with the caption, "This isn't the view at Grand Teton National Park in Wyoming today, but it will be come summer. Scotty Perkins captured this shot of the Teton Range and the meandering Snake River at dawn - a shot that was made famous by Ansel Adams."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 26, 2015 with the caption, "A gorgeous early spring morning shot of Yosemite National Park in California. Pictured here is part of the YosemiteValley, which is home to many of the park's famous cliffs and waterfalls. Photo by Douglas Croft."
    @USInterior/Instagram
  • The US Dept. of the Interior posted this photo to Instagram on March 27, 2015 with the caption, "The sky is ablaze with color at the Jefferson Memorial -- which is part of the National Mall and Memorial Parks in Washington".
    @USInterior/Instagram
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