Built around 1365, it’s one of only two remnants left from the 1834 fire that ravaged the Royal Palace of Westminster. Quiet and easily overlooked, this three-level stone tower, once a moatside storehouse for Edward III’s treasures, has walls so thick it was later considered an ideal setting for taking accurate measurements. So you’ll see some explanation of weights-and-measures standards and some relics dug up from the moat (including a 1,200-year-old sword, and a bulbous bottle from the Sun, a 17th-c. tavern where Samuel Pepys drank).