Saber-tooth Cats, dinosaurs and Ice Age mammals will be among the star attractions during National Fossil Day. Activities are being held around the nation in this first ever event to focus on some interesting—and really old—stuff.

Among Yellowstone National Park's various geothermal basins, the Norris Geyser Basin just might be the most colorful, and it's long been accepted that it's the hottest. But how hot is it? The U.S. Geological Survey can tell you, thanks to a network of monitors that is taking the basin's temperature.

For only the second time in the past 150 years, Civil War buffs have the chance to view a rare collection of original firsthand drawings from that era. The 44 images were made both on and off the battlefield by Joseph Becker and other artist-correspondents, and they're on public display at Saint-Gaudens National Historic Site in New Hampshire through October 11.

Despite its remote location in southern Alaska, Katmai National Park and Preserve packs a surprising economic clout for the state, generating nearly $40 million a year, according to a study.