How did Queen Catherine of Valois, wife of King Henry V of England, become a gruesome tourist attraction in London’s Westminster Abbey?
Answer: After her death in 1437, she was buried in the Abbey. Some years later the lid of her tomb became displaced, revealing her remains. The site became a popular feature for those visiting the abbey; the renowned English period figure Samuel Pepys recorded his visit in 1669. The queen was only properly reburied in the nineteenth century.
Source: Dreadful Fates by Tracey Turner