On the Washington-Idaho border sits Buffalo Eddy, a site where the Nez Perce left their mark a la petroglyphs carved into the rock next to the Snake River. A short trail with informative signage offers information about the petroglyphs and their creators. Read more about the petroglyphs and the Nez Perce people on the National Park Service website.
Note: Please be respectful of the area and the petroglyphs, and report any damage to the National Park Service. This area and the petroglyphs in it are sacred to the Nez Perce; collecting rocks and defacing the petroglyphs are against the law.