Carl Griffin: Medieval octagonal lighthouse tower built in 1328 as penance for plundering church property from a ship wreck. Great views. Run by English heritage.
Carl Griffin: Huge Norman keep guarding the crossing of the River Medway. The keep was destroyed during the Barons war by King John, though rebuilt soon afterwards. Run by English heritage.
Carl Griffin: Sole surviver of the Privy Palace within the great medieval palace of Westminster. Built to safeguard Edward III's royal treasures. Run by English heritage.