No building has been more intimately involved in the story of Britain than the Tower of London - a mighty, brooding stronghold in the very heart of the capital. Castle, prison, torture chamber, execution site, zoo, mint, treasure house, armoury, observatory: the Tower has been all these things and more, standing at the epicentre of dramatic, bloody and frequently cruel events for almost a thousand years. Setting this dramatic story firmly in the context of national - and international - events,