While this London attraction can be incredibly bus...

While this London attraction can be incredibly busy and there is a significant cost in going within it is still well worth the visit. The White Tower built as a symbol his power was built by William the conqueror not long after his invasion. With a long history of various vocations from palace, to prison, to mint. Be sure to also take the time to visit the crown jewels. See the ravens. If you can, though it requires tremendous forethought in order to get tickets, it is free to watch the historical Ceremony of the Keys.