This road takes you to some really impressive ghost towns. Harshaw and Duquesne are quite well preserved, with some of the old structures still standing. This area used to be a border crossing point into Mexico, and border patrol still actively patrols the area. Its very popular with ATVs, and can get crowded at times. Be sure to stay on the numbered routes.
Washington Camp and Duquesne were major mining camps in the 1880s. Working closely together to support the mining operations in the area, they each had around 1,000 residents. It is rumored that George Westinghouse of the Westinghouse Electric company once lived in Duquesne. Source: www.ghosttowns.com/states/az/ duquesne.html