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(April 15, 2016) — National Park Week begins Saturday, so the National Park Service is waiving entrance fees to all parks through April 24.

There are three national parks in the state of Indiana: George Rogers Clark National Historical Park, Lincoln Boyhood National Memorial and the Indiana Dunes State Park.

The park service also turns 100 this year, and lots of celebratory events are scheduled.

Children can earn a junior ranger badge and take part in kids’ programs on Saturday, National Junior Ranger Day.

Volunteers are welcome to help out in the parks on Earth Day, April 22.

You can find the parks in every state using the National Park Service’s online map.

CNN contributed to this story.