Yosemite National Park was established in 1864. Yosemite Valley and Mariposa Big Tree Grove combined to make the national park. Located in central California, the park encompasses over 700,000 acres. Over three million people visit the park annually. Children could visit the park’s website at: Yosemite National Park. The site presents some excellent multimedia presentations, and a great presentation on Moonbows is: Moonbows.