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The first of 2017's free-admission days at U.S. national parks is already behind us—it was Martin Luther King Day. 

But before the year is over you'll have nine more chances to enjoy at no charge all the sites maintained by the National Park Service—from all-time faves like Yosemite and Yellowstone to overlooked gems such as Big Bend in Texas and Crater Lake in Oregon (pictured above).

Here are the remaining dates when you can experience all that natural splendor for free:

February 20, Presidents' Day

April 15-16 and 22-23, the weekends of National Park Week

August 25, the National Park Service's 101st birthday

September 30, National Public Lands Day

November 11-12, Veterans Day weekend

Finally, these visitors will get in for free every day the parks are open: active-duty military service members, citizens with permanent disabilities, and children in fourth grade who sign up for the Every Kid in a Park program (their families aren't charged admission, either).

So mark your calendars and get out there and see the best America has to offer.