Happy 100th birthday to the National Park Service. Famed Yellowstone was the very first national park, recognized by Congress in 1872. But the agency didn't become official until President Woodrow Wilson signed the Organic Act of 1916, in the spirit of conservation and environmental awareness. The Park Service has since grown to include 412 national parks, monuments, battlefields, recreation areas, and more. The official centennial presents a great opportunity for everyone to plan a trip. Here are 13 tips for saving money on your next visit to a national park.
Related: 19 of the Most Underrated National Parks