In 1916, President Woodrow Wilson approved legislation to establish the National Park Service (NPS) as part of the U.S. Department of the Interior. It was charged with protecting and managing the 35 National Parks and monuments in the country. One hundred years later, in 2016, the NPS protects and manages more than 400 parks located in all 50 states, the District of Columbia, and in five of the nine U.S. territories, including American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the Virgin Islands. The NPS encompasses over 84 million acres and employs more than 20,000 people in various capacities. This article describes the mission of NPS and environmental education at NPS. Also included are: Research, Discussion, and Action: Creating a PSA about National Parks; Every Kid in a Park Initiative; Key Websites of Interest to K-6 Teachers; Other Websites of Interest; and Books for Students about National Parks.