Today is All Hallows' Eve, or Halloween. The modern holiday comes from an age-old tradition honoring the supernatural blending of the world of the living and the world of the dead. Halloween is based on a Celtic holiday called Samhain. The festival marked the start of winter and the last stage of the harvest, the slaughtering of animals. It was believed that the dark of winter allowed the spirits of the dead to transgress the borders of death and haunt the living.

Eventually, Christian holidays developed at around the same time. During the Middle Ages, November 1 became known as All Saints' Day, or All Hallows' Day. The holiday honored all of the Christian saints and martyrs. Medieval religion taught that dead saints regularly interceded in the affairs of the living. On All Saints' Day, churches held masses for the dead and put bones of the saints on display. The night before this celebration of the holy dead became known as All Hallows' Eve. People baked soul cakes, which they would set outside their house for the poor. They also lit bonfires and set out lanterns carved out of turnips to keep the ghosts of the dead away.