"First built in the 11th century to defend royal power, the Tower of London has been used as a prison and execution site. Henry VI was allegedly killed at the tower during the Wars of the Roses, as were three queens: Anne Boleyn, Catherine Howard, and Jane Grey. Today, Anne Boleyn's ghost is said to walk Tower Green, the site of her execution, and Arbella Stuart — Queen Elizabeth I’s cousin who was arrested for marrying without royal permission — is rumored to haunt the Queen’s House." - Travel + Leisure Editors