The National Parks Service celebrates its 100th birthday in August. How have Americas natural wonders impacted your life? Share your stories and photos
For 100 years, the National Parks Service has been providing Americans and international visitors alike with unspoiled vistas and vacations to match.
Ahead of the centennial on 25 August, we want to hear from you. Do you have a particularly memorable hiking adventure to tell us about? Or an undeniably beautiful shot of a waterfall or mountain range? Share your stories and photographs with us. Well feature a selection in our coverage.
You can upload your images through GuardianWitness by clicking the Contribute with GuardianWitness button above. You can also use the GuardianWitness smartphone app or the Guardian app and search for GuardianWitness assignments.
GuardianWitness is the home of readers content on the Guardian. Contribute your video, pictures and stories, and browse news, reviews and creations submitted by others. Posts will be reviewed prior to publication on GuardianWitness, and the best pieces will feature on the Guardian site.
You can also share your photos with us on Instagram by tagging @guardian_us in your shots.