The national park on the site where George Washington and the struggling Continental Army endured a tough winter during the American Revolution boasts a new feature that's a couple of hundred million years old - dozens of fossilized dinosaur footprints discovered on rocks used to pave a section of hiking trail.

Long before dinosaurs roamed the Earth, a bizarre creature with a Venus flytrap-like head swam the seas. Scientists have uncovered fossils of a tiny faceless prehistoric sea worm with 50 spines jutting out of its head.

Nevada is getting its first national monument, after Congress passed a measure setting aside nearly 23,000 acres full of prehistoric artifacts and bones.