The Kam Wah Chung& Co. Museum, also known as Kam Wah Chung Company Building, is a state park and a National Historic Landmark that preserves early Chinese culture in John Day in the U.S. state of Oregon. Built in the 1865 by George Hazeltine as a supply depot or stagecoach stop along the Dalles-Canyon City wagon road., it is the best-preserved example of a Chinese herbal apothecary and mercantile establishment dating to the post-Civil War period of growth in the Western United States.