The restaurant Sobrino de Botínis, located just off Madrid’s Plaza Mayor, claims to be the oldest restaurant in the world. I have not been there but have been fortunate to visit many restaurants around the world. I wish I had kept track of them all for the “favorites” database. There are a few dozen listed here. Most of them were enjoyable, but not all. I added ratings to the best of my recollection. Restaurants come and go, so the list is potentially outdated. I will preserve it for the sake of posterity. I might even add to the database if I get some time.