London, UK
The American Bar, located in London's Savoy hotel, is the oldest bar on this list.
Opened in 1889, it's named for the 'American'-style drinks, or cocktails, it serves.
It was home to legendary bartender Ada 'Coley' Coleman, who created the Hanky Panky cocktail, and Harry Craddock, who wrote the Savoy Cocktail Book.
A century and a quarter later, the place is still rocking -- they just launched their 125-year anniversary menu, with historically inspired cocktails grouped into 25-year eras.
Source: The World's 50 Best Bars