McDonald's just opened their 34,492nd restaurant in Vietnam. The McDonald's shown above is the second restaurant they built in Downey, Califorina.  It is the longest surviving McDonald's today.

In 1937, Patrick McDonald opened "The Airdrome", a food stand, on Huntington Drive (Route 66) near the Monrovia Airport in Monvrovia, California  Hamburgers were ten cents, and all-you-can-drink orange juice was five cents. In 1940, his two sons, Maurice and Richard ("Mac" and " Dick"), moved the entire building 40 miles (64 km) east, to West 14th and 1398 North E Streets in San Bernardino, California. The restaurant was renamed "McDonald's Bar-B-Q" and served twenty five barbecued items on their menu.

In October 1948, after the McDonald brothers realized that most of their profits came from selling hamburgers, they closed down their successful carhop drive-in to establish a streamlined system with a simple menu of just hamburgers, cheeseburgers, french fries, shakes, soft drinks, and apple pie. The carhops were eliminated to make McDonald's a self-serve operation. Mac and Dick McDonald had taken great care in setting up their kitchen like an assembly line to ensure maximum efficiency. The restaurant's name was again changed, this time to simply "McDonald's," and reopened its doors on December 12, 1948. http://en.wikipedia.org/wiki/History_of_McDonald's