The Half Dome is a granite dome in California's Yosemite National Park, whose summit at elevation 8,844 ft (2,696 m) is more than 4,700 ft (1,400 m)Error in convert: Ignored invalid option "digits=2" (help) above the floor of Yosemite Valley. Known to the local Native Americans as "Tis-sa-ack", the dome was first summitted by George G. Anderson in October 1875. It is now widely ascended, with more than 50,000 people a year climbing the class 3 "Cable Route".Photograph: David Iliff