Today the national parks face a daunting array of challenges, from land development and climate change to budget shortfalls and the changing culture of America itself.
Learn about the relationship between the National Geographic Society and the formation of the U.S. national parks.
Browse through a national parks wallpaper gallery and download photos to your desktop.
View Hundreds of Photos Hidden Inside Each Other
2015 Traveler Photo Contest
Explore the top photos, share your favorites, and browse all entries.