Enjoy the natural wonders of Yellowstone - the oldest national park in the world. In these 33 full-color images by some of the world's best photographers, you can experience a foggy morning in the Upper Geyser Basin, marvel as the Great Fountain Geyser comes to life at sunset, and savor the scenic vista of Electric Peak. This screen saver showcases over 25 sites in one of America's most beautiful national parks. See Lost Lake through the knothole of a tree, watch the sun rise over Hayden Valley, or follow an elk herd through grassy fields - all right at your own computer. With this screen saver, Old Faithful is just the beginning.