Behind the scenes at the castle and exploring its 900 years of history. This first episode focuses on the iconic Yeoman Warders, or Beefeaters, following their daily routine and the appointment of a new Chief Beefeater. Plus, a look at the tower's origins in the reign of William the Conqueror and a new exhibition dedicated to the infamous story of the princes in the tower. This royal palace houses the Crown Jewels, but also used to be the Royal Mint and, until the Second World War, a prison. It once had a moat (to flush away medieval sewage) that was later drained to accommodate exotic animals including lions, polar bears and an elephant. The Tower’s residents now use it to exercise their dogs.