
Mostly made up of embassies including that of Nepal, Norway, Russia and a rather odd blockish Slovenia at the Northern end, it is closed to all traffic other than that which can make it past the ominous security bollards, and its unclear whether you're even permitted to ride a bike.
Current residents include Lakshmi Mittal, the UK's richest man, and Russian Oligarch Leonard Blavatnik, who is reportedly worth around $7 billion, Lakshmi Mittal's daughter, and also Jonathan Hunt, the founder of Foxtons, who presumably bought in as some sort of a statement to the people who question whether Foxtons make loads of money.
For more on the fascinating street, click here.