Halloween, or Hallowe'en, is a holiday celebrated on the night of October 31. Traditional activities include trick-or-treating, Halloween festivals, bonfires, costume parties, visiting "haunted houses" and viewing horror films. Halloween originated from the Pagan festival Samhain, celebrated among the Celts of Ireland and Great Britain. Irish and Scottish immigrants carried versions of the tradition to North America in the nineteenth century. Other western countries embraced the holiday in the late twentieth century. Halloween is now celebrated in several parts of the western world, most commonly in Ireland, the United States, Canada, Puerto Rico, and the United Kingdom.