Teachers (National Park Service)National parks are America's largest classrooms. Find lesson plans about these great places. The website is user friendly and easily searchable by location, keyword, and more than 125 subjects, ranging from archeology to biology to Constitutional law. The site also features materials produced by National Park Service programs, including lesson plans from the National Register of Historic Places' award-winning Teaching with Historic Places program. At launch, the website offered more than 700 lesson plans, 140 field trips, 50 traveling trunks, 44 distance learning opportunities, 16 teachers' institutes, 47 online galleries, and 100 teacher workshops, and will add new content as it is developed. Select subjects (Language Arts, Math, Science, Social Studies); select grade level (Lower Elementary, Upper Elementary, Middle School, High School); or select Common Core.