Want to head to Yellowstone or Glacier this weekend? If so, you're in luck.

Admission has been waived at all National Parks on Sunday, August 25 to celebrate the National Park Service's 103rd birthday.

President Woodrow Wilson signed the National Park Service Act in 1916.

If you're can't make it to a National Park this weekend, there are two more free admission days coming up this year.

September 28: National Public Lands Day

November 11: Veterans Day