The Winchester Mystery House is a famous California mansion that is reputed to be haunted. Sarah Winchester, the widow of a gun magnate, began building the Winchester Mystery House in 1884 after a medium advised her to construct a house to appease the ghosts of all those killed by Winchester rifles. Construction continued for 38 years, since Sarah Winchester believed that if she stopped working on the house, she would die. What significance does the number 13 have in the mansion? Discuss