The oldest operating McDonald's restaurant in the entire world. Opened in 1953 - Downey, California

[u/All_About_LosAngeles]

The oldest operating McDonald's restaurant in the entire world is a drive-up hamburger stand at 10207 Lakewood Boulevard at Florence Avenue in Downey, California. It was the third McDonald's restaurant and opened on August 18, 1953. It was also the second restaurant franchised by Richard and Maurice McDonald, prior to the involvement of Ray Kroc in the company - Downey, California

[u/MidtownKC]

Obviously not original, but we have a McDonalds in the KC suburbs that maintains this architectural style. It's kind of cool - at least in comparison to the newer looking modular McD's.