The U.S. 12 Scenic Byway in Washington state follows the historic route of the Mullan Road, offering stunning views along the Palouse region and alongside the Snake River. This drive showcases rolling hills of wheat fields, dramatic canyons, and charming small towns like Dayton and Walla Walla. Expect a mix of modern highway sections with some winding two-lane roads; it's generally well-maintained but can be affected by seasonal weather. History buffs will appreciate the interpretive signs detailing the area’s past.