In London criminals used to be executed close to the modern Marble Arch.
From the Middle Ages to 1783 a location near the modern Marble Arch served as the principal place of public execution in England’s capital. In past times this place was called Tyburn. Today, on a traffic island we can see a plate that marks the spot where the infamous Tyburn Hanging Tree stood.

Source
Cannon, John. Ed. Dictionary of British History. rev. ed. Oxford: Oxford University Press, 2009.
Note: All photos were taken by me (Nils Zumbansen) in 2012.