The National Park Service turns 100 years old on August 25. To celebrate, all of the national parks are free through the weekend. Special events at parks around the U.S. will celebrate the anniversary. President Woodrow Wilson created the National Park Service on August 25, 1916. Thanks to the celebration, visits to national parks around the U.S. are up over three percent in 2016.
The National Park Service Turns 100

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This photo shows the mixture of fine sand and pebbles on Glen Haven beach alongside Lake Michigan at Sleeping Bear Dunes National Lakeshore in Michigan.

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A meteor streaks through the sky over Joshua trees and rocks at Joshua Tree National Park in Southern California's Mojave Desert in this 30-minute time exposure from 1998.

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John Collins shot this photo of a rare double rainbow over Fossil Butte National Monument in Wyoming.