Yosemite's famous Half Dome rising above the valley in late November. The massive granite formation was once a caldera - an underground pool of lava - unearthed by millenia of tectonic uplift. (Yosemite Valley, California)

Stock photo: Yosemite's famous Half Dome rising above the valley in late November. The massive granite formation was once a caldera - an underground pool of lava - unearthed by millenia of tectonic uplift. (Yosemite Valley, California) was taken by jeanarnhem .