Mentioned by Lonely Planet Top Choices
Top things to do in London, England
"The unmissable Tower of London (actually a castle of 22 towers) offers a window into a gruesome and compelling history. A former royal residence, treasury, mint, armoury and zoo, it's perhaps now most remembered as the prison where a king, three queens and many nobles met their deaths. Come here to see the colourful Yeoman Warders (or Beefeaters), the spectacular Crown Jewels, the soothsaying ravens and armour fit for a very large king."