Yosemite National Park

Yosemite features sheer granite cliffs, exceptionally tall waterfalls, and old-growth forests at a unique intersection of geology and hydrology. Half Dome and El Capitan rise from the park's centerpiece, the glacier-carved Yosemite Valley, and from its vertical walls drop Yosemite Falls, one of North America's tallest waterfalls at 2,425 feet (739 m) high. Three giant sequoia groves, along with a pristine wilderness in the heart of the Sierra Nevada, are home to a wide variety of rare plant and animal species. The park is 761,747 acres (3,082 km2) and receives 4,336,890 recreation visitors per year.
Photo Credit: Yosemite National Park - Yosemite Valley, California Sept 2007 by AngMoKio - CC BY-SA 2.5

U.S. National Park

1890

https://www.nps.gov/yose/getinvolved/workwithus.htm

https://www.nps.gov/yose/planyourvisit/calendar.htm

https://www.nps.gov/yose/getinvolved/volunteer.htm