The Tower of London is a historic castle on the north bank of the River Thames in central London. It was founded towards the end of 1066 as part of the Norman Conquest of England. The White Tower, which gives the entire castle its name, was built by William the Conqueror in 1078. The castle was also used as a prison from 1100 (Ranulf Flambard) until 1952 (Kray twins), although that was not its primary purpose. A grand palace early in its history, it served as a royal residence. As a whole, the Tower is a complex of several buildings set within two concentric rings of defensive walls and a moat. There were several phases of expansion, mainly under kings Richard I, Henry III, and Edward I in the 12th and 13th centuries.
There are numerous displays within the castle including the crown jewels, alas when I was there in February they were out being cleaned.
Legend has it that as long as the ravens remain within the Tower the British Empire will endure.