Wherever you are from in the world, the events that have taken place at the Tower of London may have shaped the lives of everyone. It is London's castle, but it is universally known simply as The Tower. It is Europe's best-preserved medieval fortress and within its concentric walls of fortification, the eventual liberties of the English speaking peoples were forged, through horror and bloodshed, doggedness and faith. In the very centre is the White Tower, built by William the Conqueror shortly after the Norman Conquest of 1066, the last time that this country was successfully invaded. It was built to intimidate and impress Londoners, and for centuries, the one who controlled the Tower of London effectively controlled the UK.