Former US 66 also has the honor of being designated part of the Historic Route 66 National Scenic Byway. The designation means the old highway is protected and preserved as both a National Scenic Byway and All-American Road under the supervision of the Federal Highway Administration. There is also a museum dedicated to Historic Route 66 at the Powerhouse Visitor Center in Kingman. A further byway designation was granted to the original section of US 66 through Oatman, designated the Route 66 Historic Back Country Byway by the Bureau of Land Management as part of the BLM's Back Country Byways system. The overall length of all combined sections of Historic Route 66 is . Until the addition of Historic U.S. Route 80 in 2018, Historic Route 66 was the only route in the Parkways, Historic and Scenic Roads program to span multiple counties, and was the longest state-designated historic route in Arizona. Similar to US 66, US 80 was once a heavily traveled transcontinental U.S. Highway with an iconic car culture until Interstates bypassed and replaced it. Historic Route 66 is one of Arizona's four state designated Historic Routes, with the others being Historic US 80, the Jerome-Clarkdale-Cottonwood Historic Road (Historic US 89A) and the Apache Trail Historic Road.