Granite domes are large, rounded rock formations primarily composed of granite, a type of igneous rock. They are formed through a combination of geological processes, including the slow cooling of magma beneath the Earth's surface and subsequent erosion that removes surrounding materials. This leaves behind the more resistant granite, creating a dome shape. These natural structures are often found in mountainous regions and are popular among hikers and climbers. Famous examples include the Half Dome in Yosemite National Park and El Capitan, both of which attract outdoor enthusiasts from around the world.