You don't want to go there
This is the entrance to Her Majesty's Prison in Wormwood Scrubs, it looks so much like a prison it's often used in films. Built in the 1880's using convict labour, this arial view is as close as you want to get. In case you ever get stuck inside, you may want to read this entertaining account of Soviet double agent George Blake's escape from the scrubs.
See where: London Daily Photo Map