The National Park Service will have 16 free days in 2016 to celebrate its 100 year anniversary. The list of free days for 2016 are:
January 18: Martin Luther King Jr. Day
April 16 through 24: National Park Week
August 25 through 28: National Park Service Birthday
September 24: National Public Lands Day
November 11: Veterans Day
https://www.reddit.com/r/NationalPark/comments/3v6xpa/list_of_2016_national_park_free_entrance_days/
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