Ye Olde Mitre
1 Ely Court, Ely Place (at Hatton Garden)
London, Greater London EC1N 6SJ
This place is one of the oldest bars in the world, and can trace its history all the way back to the days of Queen Elizabeth. There's all kinds of crazy mugs hanging from the ceiling, presumably so you'll have something to look at when you end up blotto on the floor.