The National Park Service is waiving entrance fees on for two weekends due to National Park Week.

As part of the park service’s centennial, national sites will be free to the public 10 days in 2017.

Out of the 120 sites and parks participating nationally, 15 are in Arizona, including Grand Canyon National Park, Casa Grande Ruins National Monument, Saguaro National Park and Tonto National Monument, among many others. The fee waiver does not apply to state parks or state wildlife or natural areas.

The waiver includes entrance fees, commercial tour fees, and transportation entrance fees. Reservation, camping, and tour fees will still be collected.

Other entrance-free dates in 2017:

- April 15-16 and 22-23: Weekends of National Park Week

- August 25: National Park Service Birthday

- September 30: National Public Lands Day

- November 11-12: Veterans Day Weekend