This Paradise Valley, Ariz., home is a car collector’s dream, with climate-controlled space for 21 cars. The show garage has original 1930s-era gas-station pumps, futuristic space-age lighting, cool red-metal cabinetry and bright red and silver floors. The garage doors feature pictures of the Phoenix airport from the same era. There is also a 4,500-square-foot drive-thru bus barn. All of the garages and showrooms connect directly to the house.