Although Yosemite National Park is perhaps best known for attractions located in the seven square mile Yosemite Valley, the park is quite large and contains popular attractions ranging from groves of giant sequoias, to glaciers and waterfalls, to dozens of granite domes.  The granite domes in particular draw millions of visitors each year, with many attempting to climb them or watch others do so.  Two of the most famous are El Capitan and Half Dome.