This long mural of Christopher Columbus is at MATZ Truck Accessories, 4535 S. 12th Avenue. Across the ocean from Columbus and his ships are Native Americans. It's worth a closer look! (If you can't see it in person, remember that you can click on any photo in this blog for a larger view. Use your browser's "back" button to return.)
There's more about Mena and his murals in the August 14, 2007 Tucson Citizen article Buildings are his canvases.